Chemical Kinetics _ Collision theory _ Arrhenius Equation

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

B)

                All collisions result in the formation of the products

C)

                Only activated collisions result in the formation of the products

D)

                Molecules which have acquired the energy of activation can collide effectively

• A

• B

• C

According to the collision theory of chemical reactions

A)

                A chemical reaction occurs with every molecular collision

B)

                Rate is directly proportional to the number of collisions per second

C)

                Reactions in the gas phase are always of zero order

D)

                Reaction rates are of the order of molecular speeds

• A

• B

• C

• D

According to the collision theory of reaction rates, rate of reaction  increases with temperature due to

A)

                Greater number of collisions

B)

                Greater velocity of the reacting molecules

C)

                Greater number of molecules have activation energy

D)

                None of the above

• A

• B

• C

• D

The reaction rate at a given temperature becomes slower, then

A)

                The free energy of activation is higher

B)

                The free energy of activation is lower

C)

                The entropy changes

D)

                The initial concentration of the reactants remains constant

• A

• B

• C

• D

A rise in temperature increases the velocity of a reaction. It is because it results in

A)

                An increased number of molecular collisions

B)

                An increased momentum of colliding molecules

C)

                An increase in the activation energy

D)

                A decrease in the activation energy

• A

• B

• C

• D

The number of collisions depend upon

A)

                Pressure             

B)

                Concentration

C)

                Temperature    

D)

                All the above

• A

• B

• C

• D

If Ef and Er are the activation energies of forward and reverse reactions and the reaction is known to be exothermic, then

A)

                Ef>Er

B)

                Ef<Er

C)

                Ef=Er

D)

                No relation can be given between Ef and Er as data are not sufficient

• A

• B

• C

• D

According to Arrhenius theory, the activation energy is

A)

                The energy it should possess so that it can enter into an effective collision

B)

                The energy which the molecule should possess in order to undergo reaction

C)

                The energy it has to acquire further so that it can enter into a effective collision

D)

                The energy gained by the molecules on colliding with another molecule

• A

• B

• C

• D

The energy of activation is

A)

                The energy associated with the activated molecules

B)

                Threshold energy -  energy of normal molecules

C)

                Threshold energy + energy of normal molecules

D)

                Energy of products ?  energy of reactants

• A

• B

• C

• D

• A

• B

• C

• D