For the zero order reaction `AtoB+C`, initial concentration of A is 0.1 M. If [A]=0.08 M after 10 minutes,then its half-life and completion time are respectively :

Options

A. 10 min, 20 min
B. `2 xx 10^(-3)` min, `4 xx 10^(-3)` min
C. 25 min, 50 min
D. 250 min, 500 min

Answer

C

Explanation

x = 0.1-0.08=0.02 M,
`k=(x)/(t)=(0.02)/(10)=2 xx 10^(-3) M min^(-1)`
`:. t_(1 // 2)=([A]_(0))/(2k)=(0.1)/(2 xx 2 xx 10^(-3))=25 min`
`t_("completion")=2 xx t_(1 // 2)=50 min`