The half-life for a zero order reaction having 0.02 M initial concentration of reactant is 100 s. The rate constant (in mol `" L"^(-1) "s"^(-1)` ) for the reaction is

Options

A. `2.0 xx 10^(-4)`
B. `2.0 xx 10^(-3)`
C. `1.0 xx 10^(-2)`
D. `1.0 xx 10^(-4)`

Answer

D

Explanation

For zero order reaction
`t_(1//2) = ( a)/ (2k)`
`k = (1)/( 2 t_(1//2))`
`k = (0.02)/( 2 xx 100)`
`= 1 xx 10^(-4) "mol L"^(-1)" s"^(-1)`