Question

A first order reaction has a half - life period of 69 .3 sec at `0.10 "Mol litre "^(-1)` reactant concentration then the rate constant will be
A. `10^(-4) sec ^(-1)`
B. `10^(-3) sec^(-1)`
C. `10^(-1) sec^(-1)`
D. `6.93xx10^(-1)sec^(-1)`

Answer 1

Correct Answer - B
Rate `=kxx ["concentration "]`
`(0.693)/(69.3)xx0.1=10^(-3)sec^(-1)`