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. 11 h
B. 4 h
C. 0.5 h
D. 0.25 h

Answer

D

Explanation

For a zero order reaction
`k=([A]_(0))/(2t_(1//2))`
Here `[A]_(0)=2M,t_(1//2)=1` hr
`:. k=2//2=1"M hr"^(-1)`
Now `t=([A]_(0)-[A])/(k)`
`=((0.5-0.25)M)/("2M hr"^(-1))=0.25` hr.