# Chemistry Class 12 NCERT Solutions: Chapter 4 Chemical-Kinetic Part 13 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Q: 27. The rate constant for the first order decomposition of is given by the following equation:

Calculate for this reaction and at what temperature will its half-period be minutes?

Arrhenius equation is given by,

The given equation is

From equation (i) and (ii) , we obtain

Also, when minutes,

It is also given that,

Q. 28. The decomposition of A into product has value of k as and energy of activation . At what temperature would k be ?

Answer:

From Arrhenius equation, we obtain

Also,

Then,

Hence, k would be

Note: There is a slight variation in this answer and the one given in the NCERT textbook.