#### My Profile

1. Inform you about time table of exam.

2. Inform you about new question papers.

3. New video tutorials information.

#### Question

Calculate the half-life of a first order reaction from their rate constants given below:

**(i)** 200 s^{−1} **(ii)** 2 min^{−1} **(iii)** 4 years^{−1}

#### Solution

#### Similar questions

(a) For a first order reaction, show that time required for 99% completion is twice the time required for the completion of 90% of reaction.

A first order reaction takes 23.1 minutes for 50% completion. Calculate the time required for 75% completion of this reaction.

(log 2 = 0.301, log 3 = 0.4771, log 4 = 0.6021)

Derive the relation between half life and rate constant for a first order reaction

Sucrose decomposes in acid solution into glucose and fructose according to the first order rate law with t_{1/2}= 3 hours. What fraction of the sample of sucrose remains after 8 hours?

During nuclear explosion, one of the products is ^{90}Sr with half-life of 28.1 years. If 1μg of ^{90}Sr was absorbed in the bones of a newly born baby instead of calcium, how much of it will remain after 10 years and 60 years if it is not lost metabolically.