A first orde reaction is 75% completed after 32min. When was 50% of the reaction completed?

Options

A. 16 min
B. 8 min
C. 4 min
D. 40 min

Answer

A

Explanation

For first order reaction, time required for completion of 75% of reaction is equal to the twice of its half-life period.
`t_(75%)=2t_(50%)`
`implies32" min"=2t_(50%)`
`thereforet_(1//2)` or `t_(50%)=16` min