The first and second dissociation constants of an acid `H_(2)A` are `1 xx 10^(-5)` and `5 xx 10^(-10)` respectively. The overall dissociation constant of the acid will be

Options

A. `9.6 xx 10^(-6)`
B. `1.4 xx 10^(-1)`
C. `1.2 xx 10^(-6)`
D. `1.3 xx 10^(-8)`

Answer

B

Explanation

`K = K_(1) xx K_(2)` ltbr?gt `k = 1 xx 10^(-5) xx 5 xx 10^(-10) = 5 xx 10^(-15)`