JEE Main & Advanced Chemistry Chemical Kinetics / रासायनिक बलगतिकी Question Bank

Rate law and Rate Constant Total Questions - 174

1)

Which of these does not influence the rate of reaction [KCET 2005]

A)
                Nature of the reactants

B)
                Concentration of the reactants

C)
                Temperature of the reaction

D)
                Molecularity of the reaction
View Solution
2)

The rate law for reaction \[A+2B=C+2D\] will be

A)
                Rate \[=K[A]\,[B]\]

B)
                Rate \[=K[A]\,[2B]\]

C)
                Rate \[=K[A]\,{{[B]}^{2}}\]

D)
                Rate \[=K\frac{[C]{{[D]}^{2}}}{[A]{{[B]}^{2}}}\]
View Solution
3)

In the reaction \[2{{N}_{2}}{{O}_{5}}\to 4N{{O}_{2}}+{{O}_{2}}\], initial pressure is \[500\,atm\] and rate constant \[K\] is \[3.38\times {{10}^{-5}}{{\sec }^{-1}}\]. After 10 minutes the final pressure of \[{{N}_{2}}{{O}_{5}}\] is               [Orissa JEE 2005]

A)
                490 atm

B)
                250 atm

C)
                480 atm

D)
                420 atm
View Solution
4)

The rate law for the reaction                 Sucrose + Water \[\xrightarrow{[{{H}^{+}}]}\] Glucose + Fructose is given by

A)
                Rate \[=K\] [sucrose] [water]

B)
                Rate \[=K\] [sucrose] [water]\[^{0}\]

C)
                Rate \[=K\] [sucrose]\[^{0}\][water]

D)
                Rate \[=K\] [sucrose]\[^{1/2}\] [water]\[^{1/2}\]
View Solution
5)

\[A+2B\to C+D\]. If \[-\frac{d[A]}{dt}=5\times {{10}^{-4}}mol\,{{l}^{-1}}{{s}^{-1}}\]1, then \[-\frac{d[B]}{dt}\] is                   [DPMT 2005]

A)
                \[2.5\times {{10}^{-4}}mol\,{{l}^{-1}}{{s}^{-1}}\]

B)
                \[5.0\times {{10}^{-4}}mol\,{{l}^{-1}}{{s}^{-1}}\]

C)
                \[2.5\times 10-3mol\,{{l}^{-1}}{{s}^{-1}}\]

D)
                \[1.0\times {{10}^{-3}}mol\,{{l}^{-1}}{{s}^{-1}}\]
View Solution
6)

The data for the reaction \[A+B\to C\] is               [CBSE PMT 1994]

Exp. \[{{[A]}_{0}}\] \[{{[B]}_{0}}\] Initial rate

(1) 0.012 0.035 0.10

(2) 0.024 0.070 0.80

(3) 0.024 0.035 0.10

(4) 0.012 0.070 0.80

                The rate law corresponds to the above data is

A)
                Rate \[=k\,{{[B]}^{3}}\]

B)
                Rate \[=k\,{{[B]}^{4}}\]

C)
                Rate \[=k\,[A]\,{{[B]}^{3}}\]

D)
                Rate \[=\,k\,{{[A]}^{2}}\,{{[B]}^{2}}\]
View Solution

The experimental data for the reaction \[2A+{{B}_{2}}\to 2AB\] is [CBSE PMT 1997]

Exp.	\[{{[A]}_{0}}\]	\[{{[B]}_{0}}\]	Rate (mole \[{{s}^{-1}}\])
(1)	0.50	0.50	\[1.6\times {{10}^{-4}}\]
(2)	0.50	1.00	\[3.2\times {{10}^{-4}}\]
(3)	1.00	1.00	\[3.2\times {{10}^{4}}\]

The rate equation for the above data is

Rate \[=k\,[{{B}_{2}}]\]

Rate \[=k\,{{[{{B}_{2}}]}^{2}}\]

Rate \[=k{{[A]}^{2}}\,{{[B]}^{2}}\]

Rate \[=k\,{{[A]}^{2}}[B]\]

View Solution

8)

The reaction \[2NO(g)+{{O}_{2}}(g)\]⇌\[2N{{O}_{2}}(g)\]is of first order. If volume of reaction vessel is reduced to 1/3, the rate of reaction would be                                            [MP PMT 2001]

A)
                1/3 times

B)
                2/3 times

C)
                3 times

D)
                6 times
View Solution
9)

For a reaction \[2A+B\to \]Products, doubling the initial concentration of both the reactants increases the rate by a factor of 8, and doubling the concentration of B alone doubles the rate. The rate law for the reaction is [MP PET 2001]

A)
                \[\gamma =k[A]{{[B]}^{2}}\]

B)
                \[\gamma =k{{[A]}^{2}}[B]\]

C)
                \[\gamma =k[A][B]\]

D)
                \[\gamma =k{{[A]}^{2}}{{[B]}^{2}}\]
View Solution
10)

For a reactions \[A+B\to \]product, it was found that rate of reaction increases four times if concentration of ?A? is doubled, but the rate of reaction remains unaffected. If concentration of ?B? is doubled. Hence, the rate law for the reaction is           [MP PET/PMT 1998; MP PMT 2003]

A)
                \[\text{rate}=k[A][B]\]

B)
                \[\text{rate}=k{{[A]}^{2}}\]

C)
                \[\text{rate}=k{{[A]}^{2}}{{[B]}^{1}}\]

D)
                \[\text{rate}=k{{[A]}^{2}}{{[B]}^{2}}\]
View Solution
11)

Velocity constant K of a reaction is affected by

A)
                Change in the concentration of the reactant

B)
                Change of temperature

C)
                Change in the concentration of the product

D)
                None of the above
View Solution
12)

Point out the wrong statement :                 For a first order reaction

A)
                Time for half-change \[({{t}_{1/2}})\] is independent of initial concentration

B)
                Change in the concentration unit does not change the rate constant \[(K)\]

C)
                Time for half-change \[\times \] rate constant \[=0.693\]

D)
                The unit of \[K\] is \[mol{{e}^{-1}}{{\min }^{-1}}\]
View Solution
13)

The rate constant of a reaction depends on [CPMT 1989; DPMT 2001]

A)
                Temperature

B)
                Mass

C)
                Weight

D)
                Time
View Solution
14)

In a first order reaction the concentration of reactant decreases from \[800\,mol/d{{m}^{3}}\] to \[50\,mol/d{{m}^{3}}\] is \[2\times {{10}^{2}}\sec \]. The rate constant of reaction in \[{{\sec }^{-1}}\] is [IIT-JEE (Screening) 2003]

A)
                \[2\times {{10}^{4}}\]

B)
                \[3.45\times {{10}^{-5}}\]

C)
                \[1.386\times {{10}^{-2}}\]

D)
                \[2\times {{10}^{-4}}\]
View Solution
15)

For a reaction \[A\to B\], the rate of reaction quadrupled when the concentration of A is doubled. The rate expression of the reaction is \[r=K{{(A)}^{n}}\]. when the value of \[n\] is

A)
                1

B)
                0

C)
                3

D)
                2
View Solution
16)

The velocity constant of a reaction is K. Which of the following statements is not true regarding K

A)
                K is a constant for a reaction at a given temperature

B)
                The value of K changes when the temperature changes

C)
                K is the velocity of the reaction at unit concentrations of the reactant

D)
                K is a constant for all reactions
View Solution
17)

For the following reaction scheme (homogeneous), the rate constant has units : \[A+B\xrightarrow{K}C\]          [MP PET 1999]

A)
                \[{{\sec }^{-1}}\,mole\]

B)
                \[{{\sec }^{-1}}\]

C)
                \[{{\sec }^{-1}}litre\ mol{{e}^{-1}}\]

D)
                sec
View Solution
18)

Which of the following oxides of nitrogen will be the most stable one                                     [NCERT 1978]

A)
                \[2N{{O}_{2}}(g)\]⇌\[{{N}_{2}}(g)+2{{O}_{2}}(g);K=6.7\times {{10}^{16}}mol\,{{l}^{-1}}\]

B)
                \[2NO(g)\]⇌ \[{{N}_{2}}(g)+{{O}_{2}}(g);\,K=2.2\times {{10}^{30}}mol\,{{l}^{-1}}\]

C)
                \[2{{N}_{2}}{{O}_{5}}(g)\]⇌\[2{{N}_{2}}(g)+5{{O}_{2}}(g);\,K=1.2\times {{10}^{34}}\,mol\,{{l}^{-5}}\]

D)
                \[2{{N}_{2}}O(g)\]⇌\[2{{N}_{2}}(g)+{{O}_{2}}(g);\,K=3.5\times {{10}^{33}}\,mol\,litr{{e}^{-1}}\]
View Solution
19)

The rate of reaction is determined by slow step reaction. The step is called

A)
                Reaction rate

B)
                Activation step

C)
                Rate determining step

D)
                None of the above
View Solution
20)

The rate of the reaction \[CC{{l}_{3}}CHO+NO\to CHC{{l}_{3}}+NO+CO\] is given by Rate \[=K\,[CC{{l}_{3}}CHO]\,[NO]\]. If concentration is expressed in moles/litre, the units of K are          [MP PET 1993]

A)
                \[litr{{e}^{2}}\,mol{{e}^{-2}}\,{{\sec }^{-1}}\]

B)
                \[mole\,litr{{e}^{-1}}{{\sec }^{-1}}\]

C)
                \[litre\,mol{{e}^{-1}}{{\sec }^{-1}}\]

D)
                \[{{\sec }^{-1}}\]
View Solution
21)

Rate constant for a reaction \[{{H}_{2}}+{{I}_{2}}\to 2HI\] is 49, then rate constant for reaction \[2HI\to {{H}_{2}}+{{I}_{2}}\] is [Bihar MEE 1997]

A)
                7

B)
                1/49

C)
                49

D)
                21

E)
                63
View Solution
22)

The reaction                 \[{{N}_{2}}{{O}_{5}}\,(\text{in}\,CC{{l}_{4}}\,\text{solution})\to 2N{{O}_{2}}(\text{solution})+\frac{1}{2}{{O}_{2}}(g)\] is of first order in \[{{N}_{2}}{{O}_{5}}\] with rate constant \[6.2\times {{10}^{-1}}{{s}^{-1}}.\] What is the value of rate of reaction when \[[{{N}_{2}}{{O}_{5}}]=1.25\,mole\,{{l}^{-1}}\]               [AFMC 1998]

A)
                \[7.75\times {{10}^{-1}}mole\,{{l}^{-1}}{{s}^{-1}}\]

B)
                \[6.35\times {{10}^{-3}}mole\,{{l}^{-1}}{{s}^{-1}}\]

C)
                \[5.15\times {{10}^{-5}}mole\,{{l}^{-1}}{{s}^{-1}}\]

D)
                \[3.85\times {{10}^{-1}}mole\,{{l}^{-1}}\,{{s}^{-1}}\]
View Solution
23)

A reaction that is of the first order with respect to reactant A has a rate constant \[6{{\min }^{-1}}.\] If we start with \[[A]=0.5\,mol\,\,{{l}^{-1}}\], when would \[[A]\]reach the value 0.05mol \[{{l}^{-1}}\] [KCET 2000]

A)
                0.384 min

B)
                0.15 min

C)
                3 min

D)
                3.84 min
View Solution
24)

The rate constant for the reaction, \[2{{N}_{2}}{{O}_{5}}\to 4N{{O}_{2}}\]\[+{{O}_{2}}\] is \[3\times {{10}^{-5}}{{\sec }^{-1}}\]. If the rate is \[2.40\times {{10}^{-5}}mol\,\,litr{{e}^{\text{-1}}}{{\sec }^{-1}}\]. Then the concentration of \[{{N}_{2}}{{O}_{5}}\](in mol litre-1) is [IIT Screening 2000]

A)
                1.4

B)
                1.2

C)
                0.04

D)
                0.8
View Solution
25)

For the reaction \[2{{N}_{2}}{{O}_{5}}\to 4N{{O}_{2}}+{{O}_{2}}\]rate of reaction and rate constant are \[1.02\times {{10}^{-4}}\]and \[3.4\times {{10}^{-5}}{{\sec }^{-1}}\] respectively. The concentration of \[{{N}_{2}}{{O}_{5}}\] at that time will be [BHU 2001]

A)
                \[1.732\]

B)
                3

C)
                \[1.02\times {{10}^{-4}}\]

D)
                \[3.4\times {{10}^{5}}\]
View Solution
26)

The rate law of the reaction \[2{{N}_{2}}{{O}_{5}}\to 4N{{O}_{2}}+{{O}_{2}}\] is [MP PET 2002]

A)
                \[r=K[{{N}_{2}}{{O}_{5}}]\]

B)
                \[r=K{{[{{N}_{2}}{{O}_{5}}]}^{2}}\]

C)
                \[r=K{{[{{N}_{2}}{{O}_{5}}]}^{0}}\]

D)
                \[r=K{{[N{{O}_{2}}]}^{4}}[{{O}_{2}}]\]
View Solution
27)

If \[R=K{{[NO]}^{2}}[{{O}_{2}}],\] rate constant may be increased by [BHU 2003]

A)
                Increasing temperature

B)
                Decreasing temperature

C)
                Increasing concentration of \[{{O}_{2}}\]

D)
                Increasing concentration of \[NO\]
View Solution
28)

The value of rate constant \[A+B\to \] products depends on [BHU 2003]

A)
                Concentration of A and B

B)
                Pressure

C)
                Temperature

D)
                All of these
View Solution
29)

The rate constant of a reaction depends upon   [BHU 2004]

A)
                Extent of reaction

B)
                Time of reaction

C)
                Temperature of the system

D)
                Concentration of the system
View Solution
30)

The rate equation for the reaction \[2A+B\to C\] is found to be: rate \[=k[A][B]\]. The correct statement in relation to this reaction is that the [AIEEE 2004]

A)
                Rate of formation of C is twice the rate of disappearance of A

B)
                \[{{t}_{1/2}}\]is a constant

C)
                Unit of k must be \[{{s}^{-1}}\]

D)
                Value of k is independent of the initial concentrations of A and B
View Solution
31)

The specific rate constant of a first order reaction depends on the [IIT 1981, 83; DPMT 1991; Bihar MEE 1995; KCET 1998]

A)
                Concentration of the reactants

B)
                Concentration of the products

C)
                Time of reaction

D)
                Temperature of reaction
View Solution
32)

If the concentration is expressed in moles per litre, the unit of the rate constant for a first order reaction is [MNR 1986; MP PET 1994, 2000, 01;Bihar MEE 1996; CPMT 1997; MP PMT 1995, 96, 99;AFMC 2002]

A)
                mole litre \[^{-1}\,{{\sec }^{-1}}\]

B)
                mole litre\[^{-1}\]

C)
                \[{{\sec }^{-1}}\]

D)
                mole\[^{-1}\] litre\[^{-1}\] sec\[^{-1}\]
View Solution
33)

The dimension of rate constant of a second order reaction involves                                         [NCERT 1982]

A)
                Neither time nor concentration

B)
                Only time

C)
                Time and concentration

D)
                Time and square of concentration
View Solution
34)

The unit of rate constant of second order reaction is usually expressed as [NCERT 1983, 84; MNR 1983; MP PMT 1994, 99]

A)
                mole litre \[{{\sec }^{-1}}\]

B)
                \[mol{{e}^{-1}}\,litr{{e}^{-1}}{{\sec }^{-1}}\]

C)
                \[mole\,litr{{e}^{-1}}\,{{\sec }^{-1}}\]

D)
                \[mol{{e}^{-1}}\,litre\,{{\sec }^{-1}}\]
View Solution
35)

A zero order reaction is one whose rate is independent of [NCERT 1981]

A)
                Temperature of the reaction

B)
                The concentrations of the reactants

C)
                The concentration of the products

D)
                The material of the vessel in which the reaction is carried out
View Solution
36)

The unit of rate constant for a zero order reaction is [NCERT 1981; MP PMT 2000; RPET 2000]

A)
                litre \[{{\sec }^{-1}}\]

B)
                litre \[mol{{e}^{-1}}\,{{\sec }^{-1}}\]

C)
                mole \[litr{{e}^{-1}}{{\sec }^{-1}}\]

D)
                mole \[{{\sec }^{-1}}\]
View Solution
37)

Which of the following rate laws has an overall order of 0.5 for reaction involving substances \[x\], \[y\] and \[z\] [AIIMS 1983]

A)
                Rate \[=K({{C}_{x}})\,({{C}_{y}})\,({{C}_{z}})\]

B)
                Rate \[=K{{({{C}_{x}})}^{0.5}}\,{{({{C}_{y}})}^{0.5}}\,{{({{C}_{z}})}^{0.5}}\]

C)
                Rate \[=K{{({{C}_{x}})}^{1.5}}\,{{({{C}_{y}})}^{-1}}{{({{C}_{z}})}^{0}}\]

D)
                Rate \[=K({{C}_{x}})\,{{({{C}_{z}})}^{n}}/{{({{C}_{y}})}^{2}}\]
View Solution
38)

The rates of a certain reaction (dc/dt) at different times are as follows                 Time                    Rate (mole litre?1 sec ?1 )                 0                              \[2.8\times {{10}^{-2}}\]                 10                           \[2.78\times {{10}^{-2}}\]                 20                           \[2.81\times {{10}^{-2}}\]                 30                           \[2.79\times {{10}^{-2}}\]                 The reaction is                                   [NCERT 1978]

A)
                Zero order

B)
                First order

C)
                Second order

D)
                Third order
View Solution
39)

For a chemical reaction \[A\to B\] it is found that the rate of reaction doubles, when the concentration of A is increased four times. The order in A for this reaction is [NCERT 1979; AIIMS 1997; J & K CET 2005]

A)
                Two

B)
                One

C)
                Half

D)
                Zero
View Solution
40)

The following data are for the decomposition of ammonium nitrate in aqueous solution                 Volume of \[{{N}_{2}}\] in cc                      Time (minutes)                                 6.25                        10                                 9.50                        15                                 11.42                     20                                 13.65                     25                                 35.05       Finally                 The order of the reaction is                                         [NCERT 1980]

A)
                Zero

B)
                One

C)
                Two

D)
                Three
View Solution
41)

The hydrolysis of ethyl acetate is a reaction of [MP PMT 1987]                 \[C{{H}_{3}}COOEt+{{H}_{2}}O\xrightarrow{{{H}^{+}}}C{{H}_{3}}COOH+EtOH\]

A)
                First order

B)
                Second order

C)
                Third order

D)
                Zero order
View Solution
42)

The rate of reaction between \[A\] and \[B\] increases by a factor of 100, when the concentration of \[A\] is increased 10 folds. The order of reaction with respect to \[A\] is [CPMT 1985]

A)
                10

B)
                1

C)
                4

D)
                2
View Solution
43)

Which of the following is a first order reaction [MP PMT 1987]

A)
                \[N{{H}_{4}}N{{O}_{2}}\to {{N}_{2}}+2{{H}_{2}}O\]

B)
                \[2HI\]\[\to \]\[{{H}_{2}}+{{I}_{2}}\]

C)
                \[2N{{O}_{2}}\to 2NO+{{O}_{2}}\]

D)
                \[2NO+{{O}_{2}}\to 2N{{O}_{2}}\]
View Solution
44)

The inversion of cane sugar is represented by                 \[{{C}_{12}}{{H}_{22}}{{O}_{11}}+{{H}_{2}}O\to {{C}_{6}}{{H}_{12}}{{O}_{6}}+{{C}_{6}}{{H}_{12}}{{O}_{6}}\]                 It is a reaction of [AFMC 1982; MP PMT 1993; RPET 2000]

A)
                Second order

B)
                Unimolecular

C)
                Pseudo unimolecular

D)
                None of the three
View Solution
45)

Which one of the following formula represents a first order reaction                                       [MP PMT 1999]

A)
                \[K=\frac{x}{t}\]

B)
                \[K=\frac{1}{2t}\left[ \frac{1}{{{(a-x)}^{2}}}-\frac{1}{{{a}^{2}}} \right]\]

C)
                \[K=\frac{2.303}{t}{{\log }_{10}}\frac{a}{(a-x)}\]

D)
                \[K=\frac{1}{t}\,\frac{x}{a(a-x)}\]
View Solution
46)

The first order rate constant for the decomposition of \[{{N}_{2}}{{O}_{5}}\] is \[6.2\times {{10}^{-4}}{{\sec }^{-1}}\]. The half life period for this decomposition in seconds is [MNR 1991; MP PET 1997; UPSEAT 2000]

A)
                1117.7

B)
                111.7

C)
                223.4

D)
                160.9
View Solution
47)

A first order reaction which is 30% complete in   30 minutes has a half-life period of          [AIIMS 1998]

A)
                24.2 min

B)
                58.2 min

C)
                102.2 min

D)
                120.2 min
View Solution
48)

The order of a reaction which has the rate expression \[\frac{dc}{dt}=K{{[E]}^{3/2}}{{[D]}^{3/2}}\] is

A)
                3/2

B)
                3

C)
                2

D)
                0
View Solution
49)

The reaction \[2{{N}_{2}}{{O}_{5}}\]⇌\[2N{{O}_{2}}+{{O}_{2}}\] follows first order kinetics. Hence, the molecularity of the reaction is

A)
                Unimolecular

B)
                Pseudo?unimolecular

C)
                Bimolecular

D)
                None of the above
View Solution
50)

A reaction involving two different reactants [KCET 1989; AIEEE 2005]

A)
                Can never be a second order reaction

B)
                Can never be a unimolecular reaction

C)
                Can never be a bimolecular reaction

D)
                Can never be a first order reaction
View Solution
51)

By ?the overall order of a reaction?, we mean

A)
                The number of concentration terms in the equation for the reaction

B)
                The sum of powers to which the concentration terms are raised in the velocity equation

C)
                The least number of molecules of the reactants needed for the reaction

D)
                The number of reactants which take part in the reaction
View Solution
52)

Catalyst decomposition of hydrogen peroxide is a ........ order reaction

A)
                First

B)
                Second

C)
                Third

D)
                Zero
View Solution
53)

The half life of a first order reaction is

A)
                Independent of the initial concentration of the reactant

B)
                Directly proportional to the initial concentration of the reactants

C)
                Inversely proportional to the initial concentration of the reactant

D)
                Directly proportional to the square of the initial concentration of the reactant
View Solution
54)

The decomposition of \[{{N}_{2}}{{O}_{5}}\] is a first order reaction represented by \[{{N}_{2}}{{O}_{5}}\to {{N}_{2}}{{O}_{4}}+\frac{1}{2}{{O}_{2}}\]. After 15 minutes the volume of \[{{O}_{2}}\] produced is \[9\,ml\] and at the end of the reaction \[35\,ml\]. The rate constant is equal to [MP PET 1995]

A)
\[\frac{1}{15}\,\ln \,\frac{35}{44}\]

B)
\[\frac{1}{15}\,\ln \,\frac{44}{26}\]

C)
\[\frac{1}{15}\,\ln \,\frac{44}{35}\]

D)
\[\frac{1}{15}\,\ln \,\frac{35}{26}\]
View Solution
55)

The unit of specific reaction rate constant for a first order (if the concentration expressed in molarity) would be [MNR 1988; UPSEAT 2000, 01]

A)
                mole \[litr{{e}^{-1}}{{s}^{-1}}\]

B)
                mole \[litr{{e}^{-1}}\]

C)
                mole \[{{s}^{-1}}\]

D)
                \[{{s}^{-1}}\]
View Solution
56)

A first order reaction requires 30 minutes for 50% completion. The time required to complete the reaction by 75% will be

A)
                45 minutes

B)
                15 minutes

C)
                60 minutes

D)
                None of these
View Solution
57)

Inversion of canesugar in dilute acid (conversion into glucose and fructose) is a

A)
                Unimolecular reaction

B)
                Bimolecular reaction

C)
                Trimolecular reaction

D)
                Pseudo-unimolecular reaction
View Solution
58)

The half life period of a first order reaction          [AMU 2000]

A)
                \[\frac{0.693}{t}\]

B)
                \[\frac{0.693}{K}\]

C)
                \[\frac{2.303}{t}\]

D)
                \[\frac{0.303}{{{K}_{1}}}\]
View Solution
59)

The order of a reaction is said to be 2 with respect to a reactant X, when               [DPMT 2000]

A)
                The rate of the reaction is proportional to [X]

B)
                The rate of the reaction is proportional \[{{[X]}^{2}}\]

C)
                Two molecules of X are present in the stoichiometric equation

D)
                The reaction occurs in two steps
View Solution
60)

Decay constant of a reaction is \[1.1\times {{10}^{-9}}/\sec \], then the half life of the reaction is

A)
                \[1.2\times {{10}^{8}}\]

B)
                \[6.3\times {{10}^{8}}\]

C)
                \[3.3\times {{10}^{8}}\]

D)
                \[2.1\times {{10}^{8}}\]
View Solution
61)

If the half life period of a reaction is inversely proportional to the initial concentration, the order of the reaction is

A)
                Zero

B)
                One

C)
                Two

D)
                Three
View Solution
62)

Which one of the following statements is wrong

A)
                Molecularity of a reaction is always a whole number

B)
                Order and molecularity of a reaction need not be same

C)
                Order of a reaction may be zero

D)
                Order of a reaction depends upon the mechanism of the reaction
View Solution
63)

The velocity constant of first order reaction is expressed in the units

A)
                Concentration per unit time

B)
                Time per unit concentration

C)
                Per unit time

D)
                Unit time per unit concentration
View Solution
64)

For reation, \[A+B\to \] products, it is found that the rate of the reaction is proportional to the concentration of A, but it is independent of the concentration of B, then

A)
                The order of the reaction 2 and molecularity 1

B)
                Molecularity of the reaction is 2 but order is 1

C)
                Order is 2 and molecularity is 2

D)
                Order of the reaction is 2 but molecularity is 0
View Solution
65)

For a zero order reaction

A)
                The concentration of the reactant does not change during the reaction

B)
                The concentration change only when the temperature changes

C)
                The rate remains constant throughout

D)
                The rate of the reaction is proportional to the concentration
View Solution
66)

If ?a? is the initial concentration and ?n? is the order of the reaction and the half life period is ?T?, then [MH CET 2000]

A)
                \[T\propto {{a}^{n-1}}\]

B)
                \[T\propto {{a}^{n}}\]

C)
                \[T\propto \frac{1}{{{a}^{n}}}\]

D)
                \[T\propto \frac{1}{{{a}^{n-1}}}\]
View Solution
67)

In presence of \[HCl\], sucrose gets hydrolysed into glucose and fructose. The concentration of sucrose was found to reduce form 0.4 M to 0.2 M in 1 hour and 0.1 M in 2 hours. The order of the reaction is

A)
                Zero

B)
                One

C)
                Two

D)
                None of these
View Solution
68)

The time of half change of a first order reaction in ....... initial concentration

A)
                Proportional to

B)
                Inversely proportional to

C)
                Independent of

D)
                Equal to
View Solution
69)

Half life period of a first order reaction is 138.6 minutes. The velocity constant of the reaction is

A)
                \[0.05\,{{\min }^{-1}}\]

B)
                \[0.00005\,{{\min }^{-1}}\]

C)
                \[0.005\,{{\min }^{-1}}\]

D)
                \[200\,{{\min }^{-1}}\]
View Solution
70)

An example of a pseudo ?unimolecular reaction is

A)
                Dissociation of hydrogen iodide

B)
                Hydrolysis of methyl acetate in dilute solution

C)
                Dissociation of phosphorus pentachloride

D)
                Decomposition of hydrogen peroxide
View Solution
71)

About half life period of a first order reaction, which one of the following statements is generally false

A)
                It is independent of initial concentration

B)
                It is independent of temperature

C)
                It decreases with the introduction of a catalyst

D)
                It increases with increase of temperature
View Solution
72)

Decomposition of nitrogen pentoxide is known to be a first order reaction 75 percent of the oxide had decomposed in the first 24 minutes. At the end of an hour, after the start of the reaction, the amount of oxide left will be

A)
                Nil

B)
                About 1%

C)
                About 2%

D)
                About 3%
View Solution
73)

A reaction \[2A\to \] products is found to follow zero oder kinetics, then

A)
                \[\frac{dx}{dt}=k{{[A]}^{2}}\]

B)
                \[\frac{dx}{dt}=k{{[A]}^{0}}\]

C)
                \[\frac{dx}{dt}=k[A]\]

D)
                \[\frac{dx}{dt}=k[2A]\]
View Solution
74)

The alkaline hydrolysis of ethyl acetate is represented by the equation                 \[C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}+NaOH\to C{{H}_{3}}COONa+{{C}_{2}}{{H}_{5}}OH\]                 Experimentally it is found that for this reaction                 \[\frac{dx}{dt}=k[C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}]\,[NaOH]\]                 Then the reaction is                                        [JIPMER 1999]

A)
                Bimolecular and of first order

B)
                Bimolecular and of second order

C)
                Pseudo?bimolecular

D)
                Pseudo?unimolecular
View Solution
75)

For the reaction \[2HI\]⇌\[{{H}_{2}}+{{I}_{2}}\], the rate of the reaction is proportional to \[{{[HI]}^{2}}\]. This means that the reaction is [AMU 1985; MP PET 2000]

A)
                Unimolecular

B)
                Bimolecular

C)
                Of first order

D)
                Of second order
View Solution
76)

Inversion of sucrose is                   [AMU 1988; MP PET 2000]

A)
                Zero order reaction

B)
                First order reaction

C)
                Second order reaction

D)
                Third order reaction
View Solution
77)

The one which is unimolecular reaction is [MP PMT 1999; UPSEAT 2001]

A)
                \[2HI\to {{H}_{2}}+{{I}_{2}}\]

B)
                \[{{N}_{2}}{{O}_{5}}\to {{N}_{2}}{{O}_{4}}+\frac{1}{2}{{O}_{2}}\]

C)
                \[{{H}_{2}}+C{{l}_{2}}\to 2HCl\]

D)
                \[PC{{l}_{3}}+C{{l}_{2}}\to PC{{l}_{5}}\]
View Solution
78)

Integrated velocity equation for first order reaction is

A)
                \[{{[A]}_{o}}=[A]\,{{e}^{-Kt}}\]

B)
                \[K={{[A]}_{o}}{{e}^{-A/t}}\]

C)
                \[Kt=2.303\,\log \,\frac{{{[A]}_{o}}}{[A]}\]

D)
                \[\log \,\frac{{{[A]}_{o}}}{[A]}=-2.303\,Kt\]
View Solution
79)

If the surface area of the reactants increases, then order of the reaction

A)
                Increases

B)
                Decreases

C)
                Remain constant

D)
                Sometimes increases and sometimes dereases
View Solution
80)

Half life period \[{{t}_{1/2}}\] for first order reaction is

A)
                K

B)
                \[\frac{1.303\,\log \,2}{K}\]

C)
                \[\frac{2.303\,\log \,2}{K}\]

D)
                \[\frac{9}{K}\]
View Solution
81)

Molecularity of reaction of inversion of sugar is

A)
                3

B)
                2

C)
                1

D)
                0
View Solution
82)

For any reaction, if we plot a graph between time ?t? and \[\log (a-x)\], a simple line is obtained. The order of reaction is

A)
                Zero

B)
                One

C)
                Two

D)
                Three
View Solution
83)

Value of velocity constant for first order reaction is \[3.46\times {{10}^{-3}}{{\min }^{-1}}\], the time for half change is

A)
                100 minutes

B)
                400 minutes

C)
                200 minutes

D)
                346 minutes
View Solution
84)

The unit of the velocity constant in case of zero order reaction is               [CPMT 1994]

A)
                \[Conc.\times tim{{e}^{-1}}\]

B)
                \[Conc{{.}^{-1}}\times time\]

C)
                \[Conc{{.}^{-1}}\times tim{{e}^{-1}}\]

D)
                \[Conc.\times {{(time)}^{2}}\]
View Solution
85)

For the reaction \[{{H}_{2}}(g)+B{{r}_{2}}(g)\to 2HBr(g)\], the experimental data suggest, rate \[=K[{{H}_{2}}]{{[B{{r}_{2}}]}^{1/2}}\]. The molecularity and order of the reaction are respectively [CPMT 1988; MP PET 1993]

A)
                \[2,\,\frac{3}{2}\]

B)
                \[\frac{3}{2},\,\frac{3}{2}\]

C)
                1, 1

D)
                \[1,\,\frac{1}{2}\]
View Solution
86)

The incorrect order indicated against the rate of reaction \[A+B\xrightarrow{K}C\] is                                       [BHU 1990]

A)
Rate                                       Order                 \[\frac{d[C]}{dt}=K[A]\]                                1

B)
                \[\frac{d[C]}{dt}=K[A]\,[B]\]                      2

C)
                \[\frac{-d\,[A]}{dt}=K\,[A]\,{{[B]}^{0}}\]               2

D)
                \[\frac{-d\,[A]}{dt}\,K\,[A]\]                      1
View Solution
87)

Which of the following statements regarding the molecularity of a reaction is wrong       [CBSE PMT 1989]

A)
                It is the number of molecules of the reactants taking part in a single step chemical reaction

B)
                It is calculated from the reaction mechanism

C)
                It may be either a whole number or fractional

D)
                It depends on the rate determining step in the reaction
View Solution
88)

Diazonium salt decomposes as                 \[{{C}_{6}}{{H}_{5}}N_{2}^{+}C{{l}^{-}}\to {{C}_{6}}{{H}_{5}}Cl+{{N}_{2}}\] At \[{{0}^{o}}C\], the evolution of \[{{N}_{2}}\] becomes two times faster when the initial concentration of the salt is doubled. Therefore, it is               [MNR 1994; UPSEAT 2002]

A)
                A first order reaction

B)
                A second order reaction

C)
                Independent of the initial concentration of the salt

D)
                A zero order reaction
View Solution
89)

In the reaction \[A+B\to \] Products, if \[B\] is taken in excess, then it is an example of [EAMCET 1992]

A)
                Second order reaction

B)
                Zero order reaction

C)
                Pseudounimolecular reaction

D)
                First order reaction
View Solution
90)

The half life of a first order reaction is \[69.35\,\sec \]. The value of the rate constant of the reaction is [CBSE PMT 1990]

A)
                \[1.0\,{{s}^{-1}}\]

B)
                \[0.1\,{{s}^{-1}}\]

C)
                \[0.01\,{{s}^{-1}}\]

D)
                \[0.001\,{{s}^{-1}}\]
View Solution
91)

The half life for the reaction \[{{N}_{2}}{{O}_{5}}\]⇌ \[2N{{O}_{2}}+\frac{1}{2}{{O}_{2}}\] in \[24\,hrs\] at \[{{30}^{o}}C\]. Starting with \[10\,g\] of \[{{N}_{2}}{{O}_{5}}\] how many grams of \[{{N}_{2}}{{O}_{5}}\] will remain after a period of 96 hours [KCET 1992]

A)
                \[1.25\,g\]

B)
                \[0.63\,g\]

C)
                \[1.77\,g\]

D)
                \[0.5\,g\]
View Solution
92)

The half life of a first order reaction is 10 minutes. If initial amount is \[0.08\,mol/litre\] and concentration at some instant is \[0.01\,mol/litre\], then \[t=\]                [Roorkee 1990]

A)
                10 minutes

B)
                30 minutes

C)
                20 minutes

D)
                40 minutes
View Solution
93)

Half life period of second order reaction is           [MP PMT 1994]

A)
                Proportional to the initial concentration of reactants

B)
                Independent of the initial concentration of reactants

C)
                Inversely proportional to initial concentration of reactants

D)
                Inversely proportional to square of initial concentration of reactants
View Solution
94)

The reaction \[2{{H}_{2}}{{O}_{2}}\to 2{{H}_{2}}O+{{O}_{2}}\] is a [Manipal MEE 1995]

A)
                Zero order reaction

B)
                First order reaction

C)
                Second order reaction

D)
                Third order reaction
View Solution
95)

In a reaction involving hydrolysis of an organic chloride in presence of large excess of water                 \[RCl+{{H}_{2}}O\to ROH+HCl\]                 [MP PET 1995]

A)
                Molecularity is 2, order of reaction is also 2

B)
                Molecularity is 2, order of reaction is 1

C)
                Molecularity is 1, order of reaction is 2

D)
                Molecularity is 1, order of reaction is also 1
View Solution
96)

The thermal decomposition of a compound is of first order. If a sample of the compound decomposes 50% in 120 minutes, in what time will it undergo 90% decomposition [MP PET 1996]

A)
                Nearly 240 minutes

B)
                Nearly 480 minutes

C)
                Nearly 450 minutes

D)
                Nearly 400 minutes
View Solution
97)

The order of a reaction with rate equals \[kC_{A}^{3/2}\,C_{B}^{-1/2}\] is [MP PET 1996, 2001]

A)
                2

B)
                1

C)
\[-\frac{1}{2}\]

D)
\[\frac{3}{2}\]
View Solution
98)

If the rate expression for a chemical reaction is given by Rate \[=k{{[A]}^{m}}{{[B]}^{n}}\]            [MP PMT 1996]

A)
                The order of the reaction is \[m\]

B)
                The order of the reaction is \[n\]

C)
                The order of the reaction is \[m+n\]

D)
                The order of the reaction is \[m-n\]
View Solution
99)

The half-life period of a first order reaction is 100 sec. The rate constant of the reaction is [MP PMT 1997; MP PET 2001]

A)
                \[6.93\times {{10}^{-3}}{{\sec }^{-1}}\]

B)
                \[6.93\times {{10}^{-4}}{{\sec }^{-1}}\]

C)
                \[0.693\,{{\sec }^{-1}}\]

D)
                \[69.3\,{{\sec }^{-1}}\]
View Solution
100)

For the first order reaction with rate constant \[k\], which expression gives the half-life period ? (Initial concentration \[=a\]) [MP PET/PMT 1998]

A)
\[\frac{{{1}^{2}}}{k}\]

B)
\[\frac{1}{ka}\]

C)
\[\frac{0.693}{k}\]

D)
\[\frac{3}{2k{{a}^{2}}}\]
View Solution
101)

The rate constant of a first order reaction whose half-life is 480 seconds, is          [MP PET 1999]

A)
                \[2.88\times {{10}^{-3}}{{\sec }^{-1}}\]

B)
                \[1.44\times {{10}^{-3}}{{\sec }^{-1}}\]

C)
                \[1.44\,{{\sec }^{-1}}\]

D)
                \[0.72\times {{10}^{-3}}{{\sec }^{-1}}\]
View Solution
102)

The conversion of \[A\to B\] follows second order kinetics. Doubling the concentration of \[A\] will increase the rate of formation of \[B\] by a factor [MP PET 1999; DCE 1999; KCET 2001; BCECE 2005]

A)
                \[1/4\]

B)
                2

C)
                \[1/2\]

D)
                4
View Solution
103)

The reaction \[2FeC{{l}_{3}}+SnC{{l}_{2}}\to 2FeC{{l}_{2}}+SnC{{l}_{4}}\] is an example of            [CBSE PMT 1996; MP PET 1999]

A)
                First order reaction

B)
                Second order reaction

C)
                Third order reaction

D)
                None of these
View Solution
104)

If reaction between \[A\] and \[B\] to give \[C\]shows first order kinetics in \[A\] and second order in \[B\], the rate equation can be written as          [MP PET 1999]

A)
                Rate \[=k\,[A]\,{{[B]}^{1/2}}\]

B)
                Rate \[=k{{[A]}^{1/2}}[B]\]

C)
                Rate \[=k\,[A]\,{{[B]}^{2}}\]

D)
                Rate \[=k{{[A]}^{2}}[B]\]
View Solution
105)

For a first order reaction, the half-life period is independent of [CBSE PMT 1999]

A)
                Initial concentration

B)
                Cube root of initial concentration

C)
                First power of final concentration

D)
                Square root of final concentration
View Solution
106)

Order of a reaction can have       [DPMT 1996]

A)
                \[+ve\] values

B)
                Whole number values

C)
                Fractional values

D)
                All of the above
View Solution
107)

The order of the reaction occurring by following mechanism should be                                  [JIPMER 1997]                 (i)            \[{{A}_{2}}\to A+A\] (fast)                 (ii)           \[A+{{B}_{2}}\to AB+B\] (slow)                 (iii)          \[A+B\to \] (fast)

A)
                \[1\,\frac{1}{2}\]

B)
                \[3\frac{1}{2}\]

C)
                2

D)
                None of these
View Solution
108)

For the reaction \[A\to B\], the rate law expression is : Rate \[=\,k\,[A]\]                 Which of the following statements is incorrect [Pb. PMT 1998]

A)
                The reaction is said to follow first order kinetics

B)
                The half life of the reaction will depend on the initial concentration of the reactant

C)
                \[k\]is constant for the reaction at a constant temperature

D)
                The rate law provides a simple way of predicting the concentration of reactants and products at any time after the start of the reaction
View Solution
109)

If initial concentration is reduced to its 1/4th in a zero order reaction, the time taken for half of the reaction to complete [BHU 1998]

A)
                Remains same

B)
                Becomes 4 times

C)
                Becomes one-fourth

D)
                Doubles
View Solution
110)

For a reaction whose rate expression is :                 Rate \[=k{{[A]}^{1/2}}{{[B]}^{3/2}}\], the order would be             [Pune CET 1998]

A)
                1.5

B)
                2

C)
                3

D)
                1
View Solution
111)

For the reaction\[A\to B\], the rate increases by a factor of 2.25 when the concentration of \[A\] is increased by 1.5. What is the order of the reaction              [KCET 1998]

A)
                3

B)
                0

C)
                2

D)
                1
View Solution
112)

For the reaction \[{{H}_{2}}+C{{l}_{2}}\xrightarrow{\text{Sunlight}}2HCl\] taking place on water, the order of reaction is [KCET 1998; AIIMS 2002; Pb. PMT 2002]

A)
                1

B)
                2

C)
                3

D)
                0
View Solution
113)

For a first order reaction, rate constant is \[0.6932\,h{{r}^{-1}}\], then half-life for the reaction is               [Bihar MEE 1997]

A)
                \[0.01\,hr\]

B)
                \[1\,hr\]

C)
                \[2\,hr\]

D)
                \[10\,hr\]

E)
                \[0.1\,hr\]
View Solution
114)

The rate constant of a reaction is \[0.69\times {{10}^{-1}}{{\min }^{-1}}\] and the initial concentration is \[0.2mol\,{{l}^{-1}}.\] The half-life period is [AIIMS 1998]

A)
                400 sec

B)
                600 sec

C)
                800 sec

D)
                1200 sec
View Solution
115)

The rate constant of a first order reaction is \[3\times {{10}^{-6}}\]per second. If the initial concentration is 0.10 m, the initial rate of reaction is [AFMC 1999 Pb. PMT 1999, 2000; BHU 1999; AIIMS 1999; KCET 2000; DCE 2004]

A)
                \[3\times {{10}^{-5}}m{{s}^{-1}}\]

B)
                \[3\times {{10}^{-6}}m{{s}^{-1}}\]

C)
                \[3\times {{10}^{-8}}m{{s}^{-1}}\]

D)
                \[3\times {{10}^{-7}}m{{s}^{-1}}\]
View Solution
116)

Certain bimolecular reactions which follow the first order kinetics are called                                        [KCET (Med.) 1999]

A)
                First order reactions

B)
                Unimolecular reactions

C)
                Bimolecular reactions

D)
                Pseudounimolecular reactions
View Solution
117)

The rate law of the reaction \[A+2B\to \]Product is given by \[\frac{d[dB]}{dt}=k[{{B}^{2}}]\]. If A is taken in excess, the order of the reaction will be                [AMU (Engg.) 1999]

A)
                1

B)
                2

C)
                3

D)
                0
View Solution
118)

For a first order reaction \[A\to \]product, the rate of reaction at \[[A]=0.2\,\,mol\,\,{{l}^{-1}}\] is \[1.0\times {{10}^{-2}}mol\,\,{{l}^{-1}}\,{{\min }^{-1}}\]. The half life period for the reaction is           [Roorkee 1999]

A)
                832 s

B)
                440 s

C)
                416 s

D)
                13.86 s
View Solution
119)

For the reaction \[A+B\to \]products, doubling the concentration of A the rate of the reaction is doubled, but on doubling the concentration of B rate remains unaltered. The over all order of the reaction is           [JIPMER 1999]

A)
                1

B)
                0

C)
                2

D)
                3
View Solution
120)

Which among the following is a false statement [KCET 1999]

A)
                Half life of a third order reaction is inversely proportional to the square of initial concentration of the reactant.

B)
                Molecularity of a reaction may be zero or fractional

C)
                For a first order reaction \[{{t}_{1/2}}=\frac{0.693}{K}\]

D)
                Rate of zero order reaction is independent of initial concentration of reactant
View Solution
121)

After how many seconds will the concentration of the reactants in a first order reaction be halved, if the decay constant is \[\text{1}\text{.155}\times \text{1}{{\text{0}}^{\text{-3}}}{{\sec }^{-1}}\]        [CBSE PMT 2000]

A)
                100 sec

B)
                200 sec

C)
                400 sec

D)
                600 sec
View Solution
122)

What is the order of a reaction which has a rate expression rate \[=K{{[A]}^{3/2}}{{[B]}^{-1}}\] [DCE 2000]

A)
                3/2

B)
                ½

C)
                0

D)
                None of these
View Solution
123)

Which of the following expression is correct for first order reaction? \[(CO)\] refers to initial concentration of reactant [DCE 2000]

A)
                \[{{t}_{1/2}}\propto CO\]

B)
                \[{{t}_{1/2}}\propto C{{O}^{-1}}\]

C)
                \[{{t}_{1/2}}\propto C{{O}^{-2}}\]

D)
                \[{{t}_{1/2}}\propto C{{O}^{0}}\]
View Solution
124)

For a reaction \[2NO(g)+C{{l}_{2}}(g)\]⇌\[\,2NOCl(g)\]. When concentration of \[C{{l}_{2}}\] is doubled, the rate of reaction becomes two times of the original. When the concentration of NO is doubled the rate becomes four times. What is the order of the reaction                                             [MP PMT 2000]

A)
                1

B)
                2

C)
                3

D)
                4
View Solution
125)

The rate constant for a second order reaction is \[8\times {{10}^{-5}}{{M}^{-1}}mi{{n}^{-1}}\]. How long will it take a 1M solution to be reduced to 0.5 M         [MH CET 2001]

A)
                \[8\times {{10}^{-5}}\]min

B)
                \[8.665\times {{10}^{3}}\]min

C)
                \[4\times {{10}^{-5}}\]min

D)
                \[1.25\times {{10}^{4}}\]min
View Solution
126)

The rate for a first order reaction is \[0.6932\times {{10}^{-2}}mol\,{{l}^{-1}}mi{{n}^{-1}}\] and the initial concentration of the reactants is 1M, \[{{T}_{1/2}}\] is equal to              [JIPMER (Med.) 2001]

A)
                \[6.932\] min

B)
                100 min

C)
                \[0.6932\times {{10}^{-3}}\] min

D)
                \[0.6932\times {{10}^{-2}}\] min
View Solution
127)

For a given reaction \[{{t}_{1/2}}=\frac{1}{Ka}.\]. The order of the reaction is [KCET 2001]

A)
                1

B)
                0

C)
                3

D)
                2
View Solution
128)

75% of a first order reaction is completed in 30 minutes. What is the time required for 93.75% of the reaction (in minutes)                                              [KCET 2001]

A)
                45

B)
                120

C)
                90

D)
                60
View Solution
129)

A First order reaction is half completed in 45 minutes. How long does it need 99.9% of the reaction to be completed [AIIMS 2001]

A)
                5 hours

B)
                7.5 hours

C)
                10 hours

D)
                20 hours
View Solution
130)

A substance ?A? decomposes by a first order reaction starting initially with [A] =2.00m and after 200 min [A] = 0.15m. For this reaction what is the value of k [AIIMS 2001]

A)
                \[1.29\times {{10}^{-2}}{{\min }^{-1}}\]

B)
                \[2.29\times {{10}^{-2}}{{\min }^{-1}}\]

C)
                \[3.29\times {{10}^{-2}}{{\min }^{-1}}\]

D)
                \[4.40\times {{10}^{-2}}{{\min }^{-1}}\]
View Solution
131)

Which of the following statements about zero order reaction is not true                                               [DCE 2001]

A)
                Its unit is \[se{{c}^{-1}}\]

B)
                The graph between log (reactant) versus rate of reaction is a straight line

C)
                The rate of reaction increases with the decrease in concentration of reactants

D)
                Rate of reaction is independent of concentration of reactants
View Solution
132)

The given reaction \[2NO+{{O}_{2}}\to 2N{{O}_{2}}\] is an example of [CBSE PMT 2001; JIPMER 2002]

A)
                First order reaction

B)
                Second order reaction

C)
                Third order reaction

D)
                None of these
View Solution
133)

Order of a reaction is decided by              [KCET 2002]

A)
                Pressure

B)
                Temperature

C)
                Molecularity

D)
                Relative concentration of reactants
View Solution
134)

From the following which is a second order reaction [AMU 2002]

A)
                \[K=5.47\times {{10}^{-4}}{{\sec }^{-1}}\]

B)
                \[K=3.9\times {{10}^{-3}}\text{mole}\,\,\text{lit}\,\,{{\sec }^{-1}}\]

C)
                \[K=3.94\times {{10}^{-4}}\text{lit}\,\,\text{mol}{{\text{e}}^{\text{-1}}}\,\,{{\sec }^{-1}}\]

D)
                \[K=3.98\times {{10}^{-5}}\text{lit}\,\,\text{mol}{{\text{e}}^{\text{-2}}}\,\,{{\sec }^{-1}}\]
View Solution
135)

For the reaction \[A+2B\to C,\] rate is given by R \[=[A]{{[B]}^{2}}\] then the order of the reaction is      [AIEEE 2002]

A)
                3

B)
                6

C)
                5

D)
                7
View Solution
136)

Units of rate constant of first and zero order reactions in terms of molarity M unit are respectively          [AIEEE 2002]

A)
                \[se{{c}^{-1}},\,\,\,M\,se{{c}^{-1}}\]

B)
                \[se{{c}^{-1}},\,\,\,M\]

C)
                \[M\,se{{c}^{-1}},\,\,\,se{{c}^{-1}}\]

D)
                \[M,\,se{{c}^{-1}}\]
View Solution
137)

The reaction \[2{{N}_{2}}{{O}_{5}}\] ⇌ \[2{{N}_{2}}{{O}_{4}}+{{O}_{2}}\] is                [MP PMT 2002]

A)
                Bimolecular and second order

B)
                Unimolecular and first order

C)
                Bimolecular and first order

D)
                Bimolecular and zero order
View Solution
138)

The half-life period for a first order reaction is 693 seconds. The rate constants for this reaction would be [MP PET 2002]

A)
                \[0.1se{{c}^{-1}}\]

B)
                \[0.01se{{c}^{-1}}\]

C)
                \[0.001se{{c}^{-1}}\]

D)
                \[0.0001se{{c}^{-1}}\]
View Solution
139)

For an elementary reaction, 2A + B\[\to \]C + D the molecularity is                                          [Kurukshetra CEE 2002]

A)
                Zero

B)
                One

C)
                Two

D)
                Three
View Solution
140)

If the order of the reaction \[x+y\xrightarrow{hv}x\,y\] is zero, it means that the rate of             [Kurukshetra CEE 2002]

A)
                Reaction is independent of temperature

B)
                Formation of activated complex is zero

C)
                Reaction is independent of the concentration of reacting species

D)
                Decomposition of activated complex is zero
View Solution
141)

For a first order reaction velocity constant, \[K={{10}^{-3}}{{s}^{-1}}\]. Two third life for it would be         [MP PET 2001; UPSEAT 2003]

A)
                1100 s

B)
                2200 s

C)
                3300 s

D)
                4400 s
View Solution
142)

In a reaction, the concentration of reactant is increased two times and three times then the increases in rate of reaction were four times and nine times respectively, order of reaction is             [UPSEAT 2003]

A)
                Zero

B)
                1

C)
                2

D)
                3
View Solution
143)

For a chemical reaction....can never be a fraction [EAMCET 2003]

A)
                Order

B)
                Half-life

C)
                Molecularity

D)
                Rate constant
View Solution
144)

75% of a first order reaction was completed in 32 minutes when was 50% of the reaction completed [AMU 1999; Kerala (Med.) 2003]

A)
                16 min.

B)
                24 min.

C)
                8 min.

D)
                4 min.
View Solution
145)

The decomposition of \[{{N}_{2}}{{O}_{5}}\] occurs as, \[2{{N}_{2}}{{O}_{5}}\to 4N{{O}_{2}}+{{O}_{2}}\], and follows Ist order kinetics, hence                 [BVP 2003]

A)
                The reaction is unimolecular

B)
                The reaction is bimolecular

C)
                \[{{T}_{1/2}}\propto {{a}^{0}}\]

D)
                None of these
View Solution
146)

Which equation is correct for first order reactions [MP PMT 2003]

A)
                \[{{t}_{1/2}}\propto {{C}^{-1}}\]

B)
                \[{{t}_{1/2}}\propto C\]

C)
                \[{{t}_{1/2}}\propto {{C}^{0}}\]

D)
                \[{{t}_{1/2}}\propto {{C}^{1/2}}\]
View Solution
147)

For the reaction system \[2NO(g)+{{O}_{2}}(g)\to 2N{{O}_{2}}(g)\] volume is suddenly produced to half its value by increasing the pressure on it. If the reaction is of first order with respect to \[{{O}_{2}}\] and second order with respect to \[NO\], the rate of reaction will           [AIEEE 2003]

A)
                Diminish to one fourth of its initial value

B)
                Diminish to one eighth of its initial value

C)
                Increase to eight times of its initial value

D)
                Increase to four times of its initial value
View Solution
148)

If the rate of the reaction is equal to the rate constant, the order of the reaction is         [CBSE PMT 2003]

A)
                3

B)
                0

C)
                1

D)
                2
View Solution
149)

The reaction \[A\to B\]follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 hour. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B           [CBSE PMT 2003]

A)
                2 hours

B)
                1 hour

C)
                0.5 hour

D)
                0.25 hour
View Solution
150)

The unit of velocity constant in case of zero order reaction is       [MP PMT 2004]

A)
                Concentration\[\times \text{Tim}{{\text{e}}^{-1}}\]

B)
                \[\text{Concentratio}{{\text{n}}^{\text{-1}}}\times \text{Tim}{{\text{e}}^{\text{-1}}}\]

C)
                \[\text{Concentration}\times \text{Tim}{{\text{e}}^{\text{2}}}\]

D)
                \[\text{Concentratio}{{\text{n}}^{\text{-1}}}\times \text{Time}\]
View Solution
151)

Which one of the following is wrongly matched [KCET 2004]

A)
                Saponification of\[C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}\]? Second order reaction

B)
                Hydrolysis of \[C{{H}_{3}}COOC{{H}_{3}}\]? Pseudo uni-molecular reaction

C)
                Decomposition of \[{{H}_{2}}{{O}_{2}}\] ? First order reaction

D)
                Combination of \[{{H}_{2}}\]and \[B{{r}_{2}}\] to give \[HBr\] ? Zero order reaction
View Solution
152)

Which of the following is an example of pseudo unimolecular reaction                                   [Pb. CET 2001]

A)
                \[C{{H}_{3}}COOC{{H}_{3}}+{{H}_{2}}O\xrightarrow{{{H}^{+}}}C{{H}_{3}}COOH+C{{H}_{3}}OH\]

B)
                \[C{{H}_{3}}COOC{{H}_{3}}+{{H}_{2}}O\xrightarrow{O{{H}^{-}}}C{{H}_{3}}COOH+C{{H}_{3}}OH\]

C)
                \[2FeC{{l}_{3}}+SnC{{l}_{2}}\to SnC{{l}_{4}}+2FeC{{l}_{2}}\]

D)
                \[NaOH+HCl\to NaCl+{{H}_{2}}O\]
View Solution
153)

Hydrolysis of DDT is a first order reaction, its half life is 10 years. Time to hydrolyse 10 g DDT to half is     [BVP 2004]

A)
                100 years

B)
                50 years

C)
                5 years

D)
                10 years
View Solution
154)

In a first order reaction, the concentration of the reactant, decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is                [AIEEE 2004]

A)
                7.5 minutes

B)
                15 minutes

C)
                30 minutes

D)
                60 minutes
View Solution
155)

In the first order reaction, the concentration of the reactant is reduced to 25% in one hour. The half life period of the reaction is           [DCE 2004]

A)
                2 hr

B)
                4 hr

C)
                1/2 hr

D)
                1/4 hr
View Solution
156)

For a reaction, \[X(g)\to Y(g)+Z(g)\]the half life period is 10 min. In What period of time would the concentration of X be reduced to 10% of original concentration        [DCE 2004]

A)
                20 min

B)
                33 min

C)
                15 min

D)
                25 min
View Solution
157)

A first order reaction with respect to the reactant A has a rate constant of \[6\ {{\sec }^{-1}}\]. If we start with [A] = 0.5 mol/litre, then in what time the concentration of A becomes 0.05 mol/litre [DCE 2004]

A)
                0.384 sec

B)
                0.214 sec

C)
                3.84 sec

D)
                0.402 sec
View Solution
158)

Order of radioactive disintegration reaction is [JEE Orissa 2004]

A)
                Zero

B)
                First

C)
                Second

D)
                Third
View Solution
159)

The rate of a first order reaction is \[1.5\times {{10}^{-2}}\ mol{{L}^{-1}}\ {{\min }^{-1}}\]at 0.5 M concentration of the reactant. The half life of the reaction is [CBSE PMT 2004]

A)
                8.73 min

B)
                7.53 min

C)
                0.383 min

D)
                23.1 min
View Solution
160)

A first order reaction was started with a decimolar solution of the reactant, 8 minutes and 20 seconds later its concentration was found to be \[M/100\]. So the rate of the reaction is                [Kerala PMT 2004]

A)
                \[2.303\times {{10}^{-5}}\ {{\sec }^{-1}}\]

B)
                \[2.303\times {{10}^{-4}}\ {{\sec }^{-1}}\]

C)
                \[4.606\times {{10}^{-3}}\ {{\sec }^{-1}}\]

D)
                \[2.606\times {{10}^{-5}}\ {{\sec }^{-1}}\]

E)
                \[2.603\times {{10}^{-4}}\ {{\sec }^{-1}}\]
View Solution
161)

Which is correct about zero order reaction [JEE Orissa 2004]

A)
                Rate of reaction depends on decay constant

B)
                Rate of reaction is independent of concentration

C)
                Unit of rate constant is concentration?1

D)
                Unit of rate constant is concentration?1 time?1
View Solution
162)

Decay of \[_{92}{{U}^{235}}\]is .....order reaction             [JEE Orissa 2004]

A)
                Zero

B)
                First

C)
                Second

D)
                Third
View Solution
163)

The half-life of 2 sample are 0.1 and 0.4 seconds. Their respective concentration are 200 and 50 respectively. What is the order of the reaction              [JEE Orissa 2004]

A)
                0

B)
                2

C)
                1

D)
                4
View Solution
164)

The following statements(s) is(are) correct          [IIT 1999]

A)
                A plot of \[\log \,{{K}_{p}}\] versus \[1/T\] is linear

B)
                A plot of \[\log \,[X]\] versus time is linear for a first order reaction \[X\to P\]

C)
                A plot of \[\log P\] versus \[1/T\] is linear at constant volume

D)
                A plot of \[P\] versus \[1/V\] is linear at constant temperature
View Solution
165)

For a first order reaction               [IIT 1998]

A)
                The degree of dissociation is equal to \[(1-{{e}^{-kt}})\]

B)
                A plot of reciprocal concentration of the reactant vs time gives a straight line

C)
                The time taken for the completion of 75% reaction is thrice the \[{{t}_{1/2}}\] of the reaction

D)
                The pre-exponential factor in the Arrhenius equation has the dimension of time \[{{T}^{-1}}\]
View Solution
166)

For reaction a \[A\to x\ P\], when \[[A]=2.2\ mM\], the rate was found to be \[2.4\ mM\ {{s}^{-1}}\]. On reducing concentration of A to half, the rate changes to \[0.6\ mM\ {{s}^{-1}}\]. The order of reaction with respect to A is                 [AIIMS 2005]

A)
                1.5

B)
                2.0

C)
                2.5

D)
                3.0
View Solution
167)

Which one of the following statement for order of reaction is not correct                                             [IIT 2005]

A)
                Order can be determined experimentally.

B)
                Order of reaction is equal to sum of the powers of concentration terms in differential rate law.

C)
                It is not affected with the stoichiometric coefficient of the reactants.

D)
                Order cannot be fractional.
View Solution
168)

\[{{t}_{\frac{1}{4}}}\] can be taken as the time taken for the concentration of a reactant to drop to \[\frac{3}{4}\] of its initial value. If the rate constant for a first order reaction is \[K\], the \[{{t}_{\frac{1}{4}}}\] can be written as [AIEEE 2005]

A)
                \[0.10/K\]

B)
                \[0.29/K\]

C)
                \[0.69/K\]

D)
                \[0.75/K\]
View Solution
169)

For a first order reaction \[A\to B\] the reaction rate at reactant concentration of \[0.01M\] is found to be \[2.0\times {{10}^{-5}}mol\ {{L}^{-1}}{{s}^{1}}\]. The half life period of the reaction is [CBSE PMT 2005]

A)
                220 s

B)
                30 s

C)
                300 s

D)
                347 s
View Solution
170)

The rate of reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of this reaction with respect to reactant B is                                                [CBSE PMT 2005]

A)
- 1

B)
- 2

C)
1

D)
2
View Solution
171)

If a substance with half life 3 days is taken at other place in 12 days. What amount of substance is left now           [AFMC 2005]

A)
                1/4

B)
                1/8

C)
                1/16

D)
                1/32
View Solution
172)

The half-life of a first order reaction having rate constant     K = 1.7 ´ 10-5 s-1 is                                      [BHU 2005]

A)
                12.1 h

B)
                9.7 h

C)
                11.3 h

D)
                1.8 h
View Solution
173)

For the reaction \[A+B\to C\], it is found that doubling the concentration of A increases the rate by 4 times, and doubling the concentration of B doubles the reaction rate. What is the overal order of the reaction.       [KCET 2005]

A)
                4

B)
                3/2

C)
                3

D)
                1
View Solution
174)

Which of the following reactions end in finite time [DPMT 2005]

A)
                0 order

B)
                1st order

C)
                2nd order

D)
                3rd order
View Solution

Study Package

Question - Rate law and Rate Constant

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Exp.	\[{{[A]}_{0}}\]	\[{{[B]}_{0}}\]	Initial rate
(1)	0.012	0.035	0.10
(2)	0.024	0.070	0.80
(3)	0.024	0.035	0.10
(4)	0.012	0.070	0.80

JEE Main & Advanced Chemistry Chemical Kinetics / रासायनिक बलगतिकी Question Bank

done Rate law and Rate Constant Total Questions - 174

Study Package

Question - Rate law and Rate Constant

Rate law and Rate Constant Total Questions - 174