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(A) The addition of catalyst lowers the ...

(A) The addition of catalyst lowers the activation barrier, yet there is no change in the enthalpy of reaction.
(R ) Enthalpy change is equal to the difference in the activation energy for the forward and the backward reactions.

A

Both (A) and (R ) are true and (R ) is the correct explanation of (A)

B

Both (A) and (R ) are true and (R ) is not the correct explanation of (A)

C

(A) is true but (R ) is false

D

Both (A) and (R ) are false

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-CHEMICAL KINETICS-Objective Exercise - 4 (Assertion (A) & Reason (R) Type Questions)
  1. (A) The rate of the reaction is the rate of change of concentration of...

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  2. (A ) If in a zero order reaction, the concentration of the reactant is...

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  3. (A) The addition of catalyst lowers the activation barrier, yet there ...

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  4. (A) In a multiple reaction, the rate determining step is the fast step...

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  5. (A) Half-life period of a reaction of first order is independent of in...

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  6. (A) Order of recation is related to molecularity of reaction (R ) Mo...

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  7. (A) The rate law equation can be found only by experiment. (R ) Rate...

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  8. (A) Reactions of higher order are rare (R ) The chances of multimole...

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  9. (A) Rate of reaction increases with increase in temperature. (R ) Nu...

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  10. (A) The mass of the products formed in a reaction depends upon the lim...

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  11. (A) Order with respect to any reactant or product can be zero or posit...

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  12. (A) The rections 2NO+O(2) to 2NO(2) and 2CO+O(2) to 2CO(2), proceed at...

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  13. (A) Hydrolysis of ethyl acetate in presence of acid is a reaction of f...

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  14. (A) The rate of reaction is always negative. (R ) Minus sign used in...

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  15. (A) A pseudo first order recation occurs slowly. (R ) Reactions of h...

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  16. (A) Half-life period is always independent of initial concentration. ...

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  17. (A) 25% of the first order reaction will be completed in 50% of the ha...

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  18. (A) All instantaneous reactions are spontaneous (R ) Spontaneous rec...

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  19. (A) All Ionic reactions are Instantaneous (R ) Ionic reactions do no...

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  20. (A) Most of the molecular reactions occur with moderate rates (R ) M...

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