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

done Rate of a reaction Total Questions - 42

• question_answer1)
  The rate of a chemical reaction  [MP PMT 1973; CPMT 1982]
  A)
                  Increases as the reaction proceeds done clear
  B)
                  Decreases as the reaction proceeds done clear
  C)
                  May increase or decrease during the reaction done clear
  D)
                  Remains constant as the reaction proceeds done clear
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• question_answer2)
  The rate of a reaction that not involve gases is not dependent on       [CPMT 1988; AFMC 1995]
  A)
                  Pressure  done clear
  B)
                  Temperature done clear
  C)
                  Concentration         done clear
  D)
                  Catalyst done clear
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• question_answer3)
  The rate at which a substance reacts depends on its [MP PMT 1987; BHU 1999; KCET 2005]
  A)
                  Atomic weight        done clear
  B)
                  Equivalent weight done clear
  C)
                  Molecular weight   done clear
  D)
                  Active mass done clear
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• question_answer4)
  The rate law for the reaction                 \[RCl+NaOH(aq)\to ROH+NaCl\] is given by Rate \[={{K}_{1}}[RCl]\]. The rate of the reaction will be            [IIT 1988]
  A)
                  Doubled on doubling the concentration of sodium hydroxide done clear
  B)
                  Halved on reducing the concentration of alkyl halide to one half done clear
  C)
                  Decreased on increasing the temperature of the reaction done clear
  D)
                  Unaffected by increasing the temperature of the reaction done clear
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• question_answer5)
  If doubling the concentration of a reactant `A' increases the rate 4 times and tripling the concentration of `A' increases the rate 9 times, the rate is proportional to    [AIIMS 1991]
  A)
                  Concentration of `A' done clear
  B)
                  Square of concentration of `A' done clear
  C)
                  Under root of the  concentration of `A' done clear
  D)
                  Cube of concentration of `A' done clear
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• question_answer6)
  The rate of chemical reaction at constant temperature is proportional to
  A)
                  The amount of products formed done clear
  B)
                  The product of masses of the reactants done clear
  C)
                  The product of the molar concentration of the reactants done clear
  D)
                  The mean free path of the reaction done clear
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• question_answer7)
  The concentration of a reactant decreases from 0.2 M to 0.1 M in 10 minutes. The rate of the reaction is
  A)
                  0.01 M     done clear
  B)
                  \[{{10}^{-2}}\] done clear
  C)
                  0.01 mol \[d{{m}^{-3}}\,{{\min }^{-1}}\]               done clear
  D)
                  1 mol \[d{{m}^{-3}}\,{{\min }^{-1}}\] done clear
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• question_answer8)
  When a reaction is progressing
  A)
                  The rate of the reaction goes on increasing done clear
  B)
                  The concentration of the products goes on decreasing done clear
  C)
                  The concentration of the reactants goes on decreasing done clear
  D)
                  The reaction rate always remains constant done clear
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• question_answer9)
  In a catalytic conversion of \[{{N}_{2}}\] to \[N{{H}_{3}}\] by Haber's process, the rate of reaction was expressed as change in the concentration of ammonia per time is \[40\times {{10}^{-3}}\,mol\,litr{{e}^{-1}}{{s}^{-1}}\]. If there are no side reaction, the rate of the reaction as expressed in terms of hydrogen is     (in mol \[litr{{e}^{-1}}{{s}^{-1}}\])
  A)
                  \[60\times {{10}^{-3}}\]                done clear
  B)
                  \[20\times {{10}^{-3}}\] done clear
  C)
                  1.200     done clear
  D)
                  \[10.3\times {{10}^{-3}}\] done clear
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• question_answer10)
  If the concentration of the reactants is increased, the rate of reaction                                    [MP PMT 1989]
  A)
                  Remains unaffected       done clear
  B)
                  Increases done clear
  C)
                  Decreases           done clear
  D)
                  May increase or decrease done clear
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• question_answer11)
  Time required for completion of ionic reactions in comparison to molecular reactions is
  A)
                  Maximum           done clear
  B)
                  Minimum done clear
  C)
                  Equal     done clear
  D)
                  None done clear
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• question_answer12)
  For reaction \[2A+B\to \] products, the active mass of B is kept constant and that of A is doubled. The rate of reaction will then                                               [MP PET 1993]
  A)
                  Increase 2 times               done clear
  B)
                  Increase 4 times done clear
  C)
                  Decrease 2 times             done clear
  D)
                  Decrease 4 times done clear
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• question_answer13)
  In a reaction \[2A+B\to {{A}_{2}}B\],  the reactant A will disappear at [MP PET 1993]
  A)
                  Half the rate that B will decrease done clear
  B)
                  The same rate that B will decrease done clear
  C)
                  Twice the rate that B will decrease done clear
  D)
                  The same rate that \[{{A}_{2}}B\] will form done clear
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• question_answer14)
  The rate of a gaseous reaction is given by the expression \[K\,[A]\,[B]\]. If the volume of the reaction vessel is suddenly reduced to 1/4th of the initial volume, the reaction rate relating to original rate will be   [Roorkee 1992]
  A)
                  1/10       done clear
  B)
                  1/8 done clear
  C)
                  8              done clear
  D)
                  16 done clear
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• question_answer15)
  A catalyst increases the rate of reaction because it [EAMCET 1992]
  A)
                  Increases the activation energy done clear
  B)
                  Decreases the energy barrier for reaction done clear
  C)
                  Decreases the collision diameter done clear
  D)
                  Increases the temperature coefficient done clear
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• question_answer16)
  For the reaction \[{{N}_{2}}(g)+3{{H}_{2}}(g)\to 2N{{H}_{3}}(g)\] under certain conditions of temperature and partial pressure of the reactants, the rate of formation of \[N{{H}_{3}}\] is \[0.001\,kg\,{{h}^{-1}}\]. The rate of conversion of \[{{H}_{2}}\] under the same conditions is [IIT 1994]
  A)
                  \[1.82\,\times {{10}^{-4}}\,kg/hr\]           done clear
  B)
                  \[0.0015\,kg/hr\] done clear
  C)
                  \[1.52\times {{10}^{4}}kg/hr\]   done clear
  D)
                  \[1.82\times {{10}^{-14}}kg/hr\] done clear
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• question_answer17)
  In the reaction \[2A+B\to {{A}_{2}}B\], if the concentration of \[A\] is doubled and of \[B\] is halved, then the rate of the reaction will                                [MP PET 1994; CBSE PMT 2000]
  A)
                  Increase by four times   done clear
  B)
                  Decrease by two times done clear
  C)
                  Increase by two times   done clear
  D)
                  Remain the same done clear
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• question_answer18)
  The term \[\left( -\frac{dc}{dt} \right)\] in a rate equation refers to the [MP PMT 1996]
  A)
                  Concentration of the reactant done clear
  B)
                  Decrease in concentration of the reactant with time done clear
  C)
                  Increase in concentration of the reactant with time done clear
  D)
                  Velocity constant of the reaction done clear
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• question_answer19)
  The rate of a reaction depends upon the              [Pb. PMT 1999]
  A)
                  Volume done clear
  B)
                  Force done clear
  C)
                  Pressure done clear
  D)
                  Concentration of reactant done clear
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• question_answer20)
  For a given reaction \[3A+B\to C+D\] the rate of reaction can be represented by              [DCE 2000]
  A)
                  \[-\frac{1}{3}\frac{d[A]}{dt}=\frac{-d[B]}{dt}=\frac{+d[C]}{dt}=\frac{+d[D]}{dt}\] done clear
  B)
                  \[-\frac{1}{3}\frac{d[A]}{dt}=\frac{d[C]}{dt}=K{{[A]}^{m}}{{[B]}^{n}}\] done clear
  C)
                  \[+\frac{1}{3}\frac{d[A]}{dt}=\frac{-d[C]}{dt}=K{{[A]}^{n}}{{[B]}^{m}}\] done clear
  D)
                  None of these done clear
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• question_answer21)
  For the reaction \[{{N}_{2}}+3{{H}_{2}}\to 2N{{H}_{3}}\] if \[\frac{\Delta [N{{H}_{3}}]}{\Delta t}=2\times {{10}^{-4}}mol\,{{l}^{-1}}{{s}^{-1}},\] the value of \[\frac{-\Delta [{{H}_{2}}]}{\Delta t}\] would be                                               [MP PMT 2000]
  A)
                  \[1\times {{10}^{-4}}mol\,\,{{l}^{-1}}{{s}^{-1}}\]                done clear
  B)
                  \[3\times {{10}^{-4}}mol\,\,{{l}^{-1}}{{s}^{-1}}\] done clear
  C)
                  \[4\times {{10}^{-4}}mol\,\,{{l}^{-1}}{{s}^{-1}}\]                done clear
  D)
                  \[6\times {{10}^{-4}}mol\,{{l}^{-1}}{{s}^{-1}}\] done clear
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• question_answer22)
  A gaseous hypothetical chemical equation \[2A\]⇌\[4B+C\]is carried out in a closed vessel. The concentration of B is found to increase by \[5\times {{10}^{-3}}mol\,\,{{l}^{-1}}\] in 10 second. The rate of appearance of B is           [AFMC 2001]
  A)
                  \[5\times {{10}^{-4}}mol\,\,{{l}^{-1}}se{{c}^{-1}}\]           done clear
  B)
                  \[5\times {{10}^{-5}}mol\,\,{{l}^{-1}}se{{c}^{-1}}\] done clear
  C)
                  \[6\times {{10}^{-5}}mol\,\,{{l}^{-1}}{{\sec }^{-1}}\]        done clear
  D)
                  \[4\times {{10}^{-4}}mol\,{{l}^{-1}}{{\sec }^{-1}}\] done clear
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• question_answer23)
  The rate of a chemical reaction depends upon  [AFMC 2002]
  A)
                  Time      done clear
  B)
                  Pressure done clear
  C)
                  Concentration   done clear
  D)
                  All of these done clear
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• question_answer24)
  The rate of disappearance of \[S{{O}_{2}}\] in the reaction \[2S{{O}_{2}}+{{O}_{2}}\to 2S{{O}_{3}}\] is \[1.28\times {{10}^{-3}}g/sec\] then the rate of formation of \[S{{O}_{3}}\] is                                    [JIPMER 2002]
  A)
                  \[0.64\times {{10}^{-3}}g/sec\]  done clear
  B)
                  \[0.80\times {{10}^{-3}}g/sec\] done clear
  C)
                  \[1.28\times {{10}^{-3}}g/sec\]  done clear
  D)
                  \[1.60\times {{10}^{-3}}g/sec\] done clear
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• question_answer25)
  When the concentration of A in the reaction \[A+B\]⇌\[AB\] is doubled, the rate of reaction will be     [MP PMT 2002]
  A)
                  Doubled               done clear
  B)
                  Decreased by half done clear
  C)
                  Unchanged         done clear
  D)
                  Increased by four times done clear
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• question_answer26)
  The velocity of the chemical reaction doubles every \[{{10}^{o}}C\] rise of temperature. If the temperature is raised by \[{{50}^{o}}C\], the velocity of the reaction increases to about
  A)
                  32 times               done clear
  B)
                  16 times done clear
  C)
                  20 times               done clear
  D)
                  50 times done clear
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• question_answer27)
  An increase in temperature by \[{{10}^{o}}C\], generally increases the rate of a reaction by
  A)
                  2 times done clear
  B)
                  10 times done clear
  C)
                  9 times done clear
  D)
                  100 times done clear
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• question_answer28)
  The temperature coefficient for reaction in which food deteriorates is 2. Then food deteriorates ...... times as rapidly at \[{{25}^{o}}C\] as it does at \[{{5}^{o}}C\]
  A)
                  Two       done clear
  B)
                  Four done clear
  C)
                  Six          done clear
  D)
                  Twenty done clear
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• question_answer29)
  The rate of a reaction is doubled for every \[{{10}^{o}}\] rise in temperature. The increase in reaction rate as a result of temperature rise from \[{{10}^{o}}\] to \[{{100}^{o}}\] is [KCET 1993; Kerala PET 2002; MP PET 2003]
  A)
                  112         done clear
  B)
                  512 done clear
  C)
                  400         done clear
  D)
                  614 done clear
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• question_answer30)
  A catalyst increases the rate of a chemical reaction by [MNR 1988; CPMT 1999; Pb. PMT 2000]
  A)
                  Increasing the activation energy done clear
  B)
                  Decreasing the activation energy done clear
  C)
                  Reacting with reactants done clear
  D)
                  Reacting with products done clear
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• question_answer31)
  Velocity constant of a reaction at 290 K was found to be\[3.2\times {{10}^{-3}}\]. At 310 K it will be about              [KCET 1989, 91]
  A)
                  \[1.28\times {{10}^{-2}}\]             done clear
  B)
                  \[9.6\times {{10}^{-3}}\] done clear
  C)
                  \[6.4\times {{10}^{-3}}\]               done clear
  D)
                  \[3.2\times {{10}^{-4}}\] done clear
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• question_answer32)
  The temperature coefficient of a reaction is
  A)
                  Specific reaction rate at \[{{25}^{o}}C\] done clear
  B)
                  Rate of the reaction at \[{{100}^{o}}C\] done clear
  C)
                  Ratio of the rate constants at temperatures \[{{35}^{o}}C\] and \[{{25}^{o}}C\] done clear
  D)
                  Ratio of the rate constants at two temperatures differing by \[{{1}^{o}}C\] done clear
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• question_answer33)
  The main function of a catalyst in speeding up a reaction is
  A)
                  To increase the rate of the forward reaction done clear
  B)
                  To change the reaction path so as to decrease the energy of activation for the reaction done clear
  C)
                  To reduce the temperature at which the reaction can occur done clear
  D)
                  To increase the energy of the molecules of the reactants done clear
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• question_answer34)
  The rate of a reaction     [CPMT 1973]
  A)
                  Increases with increase in temperature done clear
  B)
                  Decreases with increase in temperature done clear
  C)
                  Does not depend on temperature done clear
  D)
                  Does not depend on concentration done clear
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• question_answer35)
  Which of the following statements is false in relation to enzyme                                               [MP PMT 2003]
  A)
                  pH affects their functioning done clear
  B)
                  Temperature affects their functioning done clear
  C)
                  They always increase activation energy done clear
  D)
                  Their reactions are specific done clear
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• question_answer36)
  A reaction is catalysed by  ?X ?. Here ?X ? [MP PMT 2003]
  A)
                  Decreases the rate constant of reaction done clear
  B)
                  Does not affect the equilibrium constant of reaction done clear
  C)
                  Decreases the enthalpy of reaction done clear
  D)
                  Decreases the activation energy done clear
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• question_answer37)
  Which reaction characteristics are changing by the addition of a catalyst to a reaction at constant temperature (i)            Activation energy            (ii)           Equilibrium constant (iii)          Reaction entropy             (iv)         Reaction enthalpy [DCE 2003]
  A)
                  (i) Only done clear
  B)
                  (iii) only done clear
  C)
                  (i) and I(ii) only  done clear
  D)
                  All of these done clear
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• question_answer38)
  The velocity constant of a reaction at 290 K was found to be \[3.2\times {{10}^{-3}}\]. At 300 K it will be  [MP PMT 2004]
  A)
                  \[1.28\times {{10}^{-2}}\]             done clear
  B)
                  \[6.4\times {{10}^{-3}}\] done clear
  C)
                  \[9.6\times {{10}^{-3}}\]               done clear
  D)
                  \[3.2\times {{10}^{-4}}\] done clear
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• question_answer39)
  In which of the following cases, does the reaction go farthest to completion                                       [UPSEAT 2001]
  A)
                  \[K={{10}^{3}}\]                done clear
  B)
                  \[K={{10}^{-2}}\] done clear
  C)
                  \[K=10\]               done clear
  D)
                  \[K=1\] done clear
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• question_answer40)
  Rate of reaction                                                [Pb. CET 2004]
  A)
                  Decreases with increase in temperature done clear
  B)
                  Increases with increase in temperature done clear
  C)
                  May increase or decrease with increase in temperature                done clear
  D)
                  Does not depend on temperature done clear
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• question_answer41)
  For the reaction\[2{{N}_{2}}{{O}_{5(g)}}\to 4N{{O}_{2(g)}}+{{O}_{2(g)}}\], if concentration of \[N{{O}_{2}}\] in 100 seconds is increased by \[5.2\times {{10}^{-3}}m\]. Then rate of reaction will be [Kerala CET  2005]
  A)
                  \[1.3\times {{10}^{-5}}m{{s}^{-1}}\]        done clear
  B)
                  \[5\times {{10}^{-4}}m{{s}^{-1}}\] done clear
  C)
                  \[7.6\times {{10}^{-4}}m{{s}^{-1}}\]        done clear
  D)
                  \[2\times {{10}^{-3}}m{{s}^{-1}}\] done clear
  E)
                  \[2.5\times {{10}^{-5}}m{{s}^{-1}}\] done clear
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• question_answer42)
  A first order reaction complete its 10% in 20 minutes then time required to complete its 19% is  [Kerala CET  2005]
  A)
                  30 minutes          done clear
  B)
                  40 minutes done clear
  C)
                  50 minutes          done clear
  D)
                  38 minutes done clear
  E)
                  45 minutes done clear
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