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The temperature coefficient of a reactio...

The temperature coefficient of a reaction is

A

the rate constant at a fixed temperature

B

the rato of rate constants at two temperatures

C

the ratio of rate constants at two different temperatures differing by `10^(@)C`

D

the ratio fo rate constants at two pressures

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The correct Answer is:
C
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Arrhenius studied the effect of temperature on the rate of a reaction and postulated that rate constant varies with temperature exponentially as k=Ae^(-E_(a)//RT) . For most of the reactions it was found that the temperature coefficient of the reaction lies between 2 to 3. The method is generally used for finding the activation energy of a reaction. Keeping temperature constant, the effect of catalyst on the activation energy has also been studied by studying how much the rate of reaction changes in the presence of catalyst. In most of the cases, it is observed that catalyst lowers the activationenergy barrier and increases the rate of reaction. Which of the following plot will be linear?

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AAKASH SERIES-CHEMICAL KINETICS-Objective Exercise - 4 (Assertion (A) & Reason (R) Type Questions)
  1. The temperature coefficient of a reaction is

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  2. (A) Spontaneous reaction may be slow or fast. (R ) Spontaneous natur...

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  3. A: Rate of reaction increases with increasse in concentration of react...

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  4. A: Hydrolysis of an ester is a slow reaction R: Reactions between co...

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  5. (A) All collisions lead to chemical reaction (R ) All molecules brin...

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  6. A: Order of reaction is evaluated from the mechanism of a reaction ...

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  7. A: A catalyst increases the rate of a reaction. R: In presence of a ...

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  8. (A) The rate of the reaction is the rate of change of concentration of...

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

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

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

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

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

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

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

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

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

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

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

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

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

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