Home
Class 12
CHEMISTRY
The rate constant of a first order react...

The rate constant of a first order reaction is doubled when the temperature is increased from `20^(@)C` to `25^(@)C`. How many times the rate constant will increase if the temperature is raised from `20^(@)C` to `40^(@)C`?

A

4

B

8

C

16

D

32

Text Solution

Verified by Experts

The correct Answer is:
C
For every `5^(@)` rise in temperature, the rate constant becomes double.
`therefore` For `20^(@)C` (`5xx4` times) rise in temperature, the rate constant, `k=2^(4)=16`.
Promotional Banner

Similar Questions

Explore conceptually related problems

Why rate of a reaction increase when temperature increases?

The activation energy for a reaction which doubles the rate when the temperature is raised from 300 K to 310 K is

The rate constant k of a reaction increases three fold when temperature changes from 127^(@) C to 45^(@) C calculate the energy of activation for this reaction

The rate of a reaction gets doubted when temperature increases from 27°C to 37°C. By what factor will it change for the temperature range 17°C to 27°C

The rate constant of.a reaction at 293 K is 1.7xx10^5s^-1 When the temperature Is increased by 20.K, the rate constant Is increased to 2.57 xx 10^5s^-1 . Calculate Ea and A of the reaction.

Assertion : When water is heated from 25^(@)C" to "50^(@)C , its pH increases Reason : The ionic product of water (Kw) increases with increase in temperature.