The time for half-life period of a certain reaction, `A rarr` products is `1 h`. When the initial concentration of the reactant `'A'` is `2.0 "mol" L^(-1)`, how much time does it take for its concentration to come from `0.50` to `0.25 "mol" L^(-1)`, if it is zero order reaction ?

Options

A. 4h
B. 0.5 h
C. 0.25 h
D. 1 h

Answer

C

Explanation

For a zero order reaction `K=x/t`………. (1)
for zero order reaction `K=[A]_(0)/(2r_(1//2))`………(2)
since `[A]_(0) = 2m, t_(1/2) =1h, K=1`
`therefore` from equation (1)
`t=0.25/1 = 0.25 h`