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

done Collision theory, Energy of activation and Arrhenius equation Total Questions - 36

• question_answer1)
  A large increase in the rate of a reaction for a rise in temperature is due to           [EAMCET 1980; MP PET 1995]
  A)
                  The decrease in the number of collisions done clear
  B)
                  The increase in the number of activated molecules done clear
  C)
                  The shortening of the mean free path done clear
  D)
                  The lowering of the activation energy done clear
  View Solution play_arrow

• question_answer2)
  Which of the following statements is not true according to collision theory of reaction rates
  A)
                  Collision of molecules is a precondition for any reaction to occur done clear
  B)
                  All collisions result in the formation of the products done clear
  C)
                  Only activated collisions result in the formation of the products done clear
  D)
                  Molecules which have acquired the energy of activation can collide effectively done clear
  View Solution play_arrow

• question_answer3)
  According to the collision theory of chemical reactions
  A)
                  A chemical reaction occurs with every molecular collision done clear
  B)
                  Rate is directly proportional to the number of collisions per second done clear
  C)
                  Reactions in the gas phase are always of zero order done clear
  D)
                  Reaction rates are of the order of molecular speeds done clear
  View Solution play_arrow

• question_answer4)
  According to the collision theory of reaction rates, rate of reaction  increases with temperature due to
  A)
                  Greater number of collisions done clear
  B)
                  Greater velocity of the reacting molecules done clear
  C)
                  Greater number of molecules have activation energy done clear
  D)
                  None of the above done clear
  View Solution play_arrow

• question_answer5)
  The reaction rate at a given temperature becomes slower, then [MP PMT 1993; DPMT 2000]
  A)
                  The free energy of activation is higher done clear
  B)
                  The free energy of activation is lower done clear
  C)
                  The entropy changes done clear
  D)
                  The initial concentration of the reactants remains constant done clear
  View Solution play_arrow

• question_answer6)
  A rise in temperature increases the velocity of a reaction. It is because it results in
  A)
                  An increased number of molecular collisions done clear
  B)
                  An increased momentum of colliding molecules done clear
  C)
                  An increase in the activation energy done clear
  D)
                  A decrease in the activation energy done clear
  View Solution play_arrow

• question_answer7)
  The number of collisions depend upon
  A)
                  Pressure              done clear
  B)
                  Concentration done clear
  C)
                  Temperature     done clear
  D)
                  All the above done clear
  View Solution play_arrow

• question_answer8)
  If \[{{E}_{f}}\] and \[{{E}_{r}}\] are the activation energies of forward and reverse reactions and the reaction is known to be exothermic, then
  A)
                  \[{{E}_{f}}>{{E}_{r}}\] done clear
  B)
                  \[{{E}_{f}}<{{E}_{r}}\] done clear
  C)
                  \[{{E}_{f}}={{E}_{r}}\] done clear
  D)
                  No relation can be given between \[{{E}_{f}}\] and \[{{E}_{r}}\] as data are not sufficient done clear
  View Solution play_arrow

• question_answer9)
  According to Arrhenius theory, the activation energy is
  A)
                  The energy it should possess so that it can enter into an effective collision done clear
  B)
                  The energy which the molecule should possess in order to undergo reaction done clear
  C)
                  The energy it has to acquire further so that it can enter into a effective collision done clear
  D)
                  The energy gained by the molecules on colliding with another molecule done clear
  View Solution play_arrow

• question_answer10)
  The energy of activation is
  A)
                  The energy associated with the activated molecules done clear
  B)
                  Threshold energy ?  energy of normal molecules done clear
  C)
                  Threshold energy + energy of normal molecules done clear
  D)
                  Energy of products ?  energy of reactants done clear
  View Solution play_arrow

• question_answer11)
  Which one of the following does not represent Arrhenius equation
  A)
                  \[k=A{{e}^{-E/RT}}\] done clear
  B)
                  \[{{\log }_{e}}k={{\log }_{e}}A-\frac{E}{RT}\] done clear
  C)
                  \[{{\log }_{10}}k={{\log }_{10}}A-\frac{E}{2.303\,RT}\] done clear
  D)
                  \[k=A{{E}^{-RT}}\] done clear
  View Solution play_arrow

• question_answer12)
  On increasing the temperature, the rate of the reaction increases because of                                    [MP PMT 1997]
  A)
                  Decrease in the number of collisions done clear
  B)
                  Decrease in the energy of activation done clear
  C)
                  Decrease in the number of activated molecules done clear
  D)
                  Increase in the number of effective collisions done clear
  View Solution play_arrow

• question_answer13)
  Energy of activation of a reactant is reduced by
  A)
                  Increased temperature done clear
  B)
                  Reduced temperature done clear
  C)
                  Reduced pressure           done clear
  D)
                  Increased pressure done clear
  View Solution play_arrow

• question_answer14)
  The minimum energy a molecule should possess in order to enter into a fruitful collision is known as [Kurukshetra CEE 2002]
  A)
                  Reaction energy               done clear
  B)
                  Collision energy done clear
  C)
                  Activation energy            done clear
  D)
                  Threshold energy done clear
  View Solution play_arrow

• question_answer15)
  Activation energy is
  A)
                  The amount of energy to be added to the actual energy of a molecule so that the threshold energy is reached done clear
  B)
                  The amount of energy the molecule must contain  so that it reacts done clear
  C)
                  The energy which a molecule should have in order to enter into an effective collision done clear
  D)
                  The average kinetic energy of the molecule done clear
  View Solution play_arrow

• question_answer16)
  The reason for almost doubling the rate of reaction on increasing the temperature of the reaction system by \[{{10}^{oC}}\] is [J & K 2005]
  A)
                  The value of threshold energy increases done clear
  B)
                  Collision frequency increases done clear
  C)
                  The fraction of the molecule having energy equal to threshold energy or more increases done clear
  D)
                  Activation energy decreases done clear
  View Solution play_arrow

• question_answer17)
  The activation energy for a simple chemical reaction \[A\to B\] is \[{{E}_{a}}\] in forward direction. The activation energy for reverse reaction                                        [CBSE PMT 2003]
  A)
                  Is always double of \[{{E}_{a}}\] done clear
  B)
                  Is negative of \[{{E}_{a}}\] done clear
  C)
                  Is always less than \[{{E}_{a}}\] done clear
  D)
                  Can be less than or more than \[{{E}_{a}}\] done clear
  View Solution play_arrow

• question_answer18)
  Arrhenius equation is
  A)
                  \[\frac{d\,\ln \,K}{dT}=\Delta {{E}^{*}}/RT\]        done clear
  B)
                  \[\frac{d\,\ln \,K}{dT}=\Delta {{E}^{*}}/R{{T}^{2}}\] done clear
  C)
                  \[\frac{d\,\ln \,K}{dT}=-\Delta {{E}^{*}}/R{{T}^{2}}\]       done clear
  D)
                  \[\frac{d\,\ln \,K}{dT}=-\Delta {{E}^{*}}/RT\] done clear
  View Solution play_arrow

• question_answer19)
  Activation energy of any reaction depends on
  A)
                  Temperature done clear
  B)
                  Nature of reactants done clear
  C)
                  Number of collisions per unit time done clear
  D)
                  Concentration of reactants done clear
  View Solution play_arrow

• question_answer20)
  Relation between rate constant and temperature by Arrhenius equation is
  A)
                  \[{{\log }_{e}}A={{\log }_{e}}K+\frac{{{E}_{a}}}{RT}\]      done clear
  B)
                  \[\log \,K=A\,\frac{{{E}_{a}}}{RT}\] done clear
  C)
                  \[{{\log }_{e}}K={{\log }_{e}}A-\frac{{{E}_{a}}}{R{{T}^{2}}}\]        done clear
  D)
                  \[\log A=RT\,\ln \,{{E}_{a}}-\ln \,K\] done clear
  View Solution play_arrow

• question_answer21)
  An endothermic reaction \[A\to B\] has an activation energy \[15\,kcal/mole\] and energy of reaction \[5\,kcal/mole\]. The activation energy of the reaction \[B\to A\] is            [Pb. CET 1985]
  A)
                  20 kcal/mole      done clear
  B)
                  15 kcal/mole done clear
  C)
                  10 kcal/mole      done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer22)
  Which of the following plots is in accordance with the Arrhenius equation
  A)
                                          done clear
  B)
                  done clear
  C)
                                done clear
  D)
                  done clear
  View Solution play_arrow

• question_answer23)
  The Arrhenius equation expressing the effect of temperature on the rate constant of a reaction is [MP PET 1997]
  A)
                  \[k={{e}^{-{{E}_{a}}/RT}}\]          done clear
  B)
                  \[k={{E}_{a}}/RT\] done clear
  C)
                  \[k={{\log }_{e}}\,\frac{{{E}_{a}}}{RT}\] done clear
  D)
                  \[k=A{{e}^{-{{E}_{a}}/RT}}\] done clear
  View Solution play_arrow

• question_answer24)
  For a reaction, activation energy \[({{E}_{a}})=0\] and rate constant \[(K)=3.2\times {{10}^{6}}{{s}^{-1}}\]at 300 K. What is the value of the rate constant at 310 K                                   [KCET (Med.) 1999]
  A)
                  \[3.2\times {{10}^{-12}}{{s}^{-1}}\]          done clear
  B)
                  \[3.2\times {{10}^{6}}{{s}^{-1}}\] done clear
  C)
                  \[6.4\times {{10}^{12}}{{s}^{-1}}\]            done clear
  D)
                  \[6.4\times {{10}^{6}}{{s}^{-1}}\] done clear
  View Solution play_arrow

• question_answer25)
  Activation energy is given by the formula             [DCE 1999]
  A)
                  \[\log \frac{{{K}_{2}}}{{{K}_{1}}}=\frac{{{E}_{a}}}{2.303R}\left[ \frac{{{T}_{2}}-{{T}_{1}}}{{{T}_{1}}{{T}_{2}}} \right]\] done clear
  B)
                  \[\log \frac{{{K}_{1}}}{{{K}_{2}}}=-\frac{{{E}_{a}}}{2.303R}\left[ \frac{{{T}_{2}}-{{T}_{1}}}{{{T}_{1}}{{T}_{2}}} \right]\] done clear
  C)
                  \[\log \frac{{{K}_{1}}}{{{K}_{2}}}=-\frac{{{E}_{a}}}{2.303R}\left[ \frac{{{T}_{1}}-{{T}_{2}}}{{{T}_{1}}{{T}_{2}}} \right]\]               done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer26)
  A reaction having equal activation energies for forward and reverse reaction has              [MP PMT 2002]
  A)
                  \[\Delta H=0\]   done clear
  B)
                  \[\Delta S=0\] done clear
  C)
                  Zero order          done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer27)
  Collision theory is applicable to [MP PMT 2002]
  A)
                  First order reactions       done clear
  B)
                  Zero order reactions done clear
  C)
                  Bimolecular reactions     done clear
  D)
                  Intra molecular reactions done clear
  View Solution play_arrow

• question_answer28)
  A graph plotted between log K vs 1/T for calculating activation energy is shown by           [MP PET 2002]
  A)
                  done clear
  B)
                  done clear
  C)
                       done clear
  D)
                  done clear
  View Solution play_arrow

• question_answer29)
  The rate constant of a  reaction at temperature 200K is 10 times less than the rate constant at 400 K. What is the activation energy \[({{E}_{a}})\]of the reaction (R = gas constant) [EAMCET 2003]
  A)
                  1842.4 R               done clear
  B)
                  921.2 R done clear
  C)
                  460.6 R  done clear
  D)
                  230.3 R done clear
  View Solution play_arrow

• question_answer30)
  In respect of the equation \[k=A{{e}^{-{{E}_{a}}/RT}}\] in chemical kinetics, which one of the following statement is correct [AIEEE 2003]
  A)
                  k is equilibrium constant done clear
  B)
                  A is adsorption factor done clear
  C)
                  \[{{E}_{a}}\]is energy of activation done clear
  D)
                  R is Rydberg?s constant done clear
  View Solution play_arrow

• question_answer31)
  The rate constant is doubled when temperature increases from 27°C to 37°C. Activation energy in kJ is     [JEE Orissa 2004]
  A)
                  34           done clear
  B)
                  54 done clear
  C)
                  100         done clear
  D)
                  50 done clear
  View Solution play_arrow

• question_answer32)
  The activation energy of a reaction is zero. The rate constant of this reaction
  A)
                  Increases with increase of temperature done clear
  B)
                  Decreases with an increase of temperature done clear
  C)
                  Decreases with decrease of temperature done clear
  D)
                  Is independent of temperature done clear
  View Solution play_arrow

• question_answer33)
  The rate constant is given by the equation \[k=pz{{e}^{-E/RT}}\]. Which factor should register a decrease for the reaction to proceed more rapidly             [MP PET/PMT 1998]
  A)
                  \[T\]      done clear
  B)
                  \[Z\] done clear
  C)
                  \[E\]      done clear
  D)
                  \[p\] done clear
  View Solution play_arrow

• question_answer34)
  An endothermic reaction with high activation energy for the forward reaction is given by the diagram:   [AIIMS 2005]
  A)
                  done clear
  B)
                  done clear
  C)
                                 done clear
  D)
                  done clear
  View Solution play_arrow

• question_answer35)
  Consider an endothermic reaction \[X\to Y\] with the activation energies \[{{E}_{b}}\] and \[{{E}_{f}}\] for the backward and forward reactions, respectively, in general             [AIEEE 2005]
  A)
                  \[{{E}_{b}}<{{E}_{f}}\] done clear
  B)
                  \[{{E}_{b}}>{{E}_{f}}\] done clear
  C)
                  \[{{E}_{b}}={{E}_{f}}\] done clear
  D)
                  There is no definite relation between \[{{E}_{b}}\] and \[{{E}_{f}}\] done clear
  View Solution play_arrow

• question_answer36)
  Temperature dependent equation can be written as [Orrisa JEE 2005]
  A)
                  \[\ln \,k=\ln A-{{e}^{{{E}_{a}}/RT}}\]       done clear
  B)
                  \[\ln k=\ln A+{{e}^{{{E}_{a}}/RT}}\] done clear
  C)
                  \[\ln k=\ln A-{{e}^{RT/{{E}_{a}}}}\]          done clear
  D)
                  All of these done clear
  View Solution play_arrow