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

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Q: 24. Consider a certain reaction with. Calculate the concentration of A remaining after s if the initial concentration of A is .

Answer:

Since the unit of , the given reaction is a first order reaction.

Therefore,

Hence, the remaining concentration of A is .

Q: 25. Sucrose decomposes in acid solution into glucose and fructose according to the first order rate law, with hours. What fraction of sample of sucrose remains after hours?

Answer:

For a first order reaction,

It is given that,

Therefore,

Then,

Hence, the fraction of sample of sucrose that remains after hours is .

Q: 26. The decomposition of hydrocarbon follows the equation calculate .

Answer:

The given equation is

Arrhenius equation is given by,

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