# Chemistry Class 12 NCERT Solutions: Chapter 4 Chemical-Kinetic Part 14

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Q: 29. The time required for completion of a first order reaction at is equal to that required for its completion atIf the value of. Calculate k at 318 K and.

Answer:

For a first order reaction,

At

At

According to the question,

From Arrhenius equation, we obtain

To calculate k at,

It is given that,

Again, from Arrhenius equation, we obtain

Therefore,

Q: 30. The rate of a reaction quadruples when the temperature changes from. Calculate the energy of activation of the reaction assuming that it does not change with temperature.

Answer:

From Arrhenius equation, we obtain

It is given that,

Therefore,

Hence, the required energy of activation is .