If for a binary weak electrolyte the solubility product is `4xx10^(-10) ` at 298K.Calculate its solubility is mol `dm^(-3)` at the same temperature

Options

A. `4 xx 10^(-5)`
B. `2 xx 10^(-5)`
C. `8 xx 10^(-10)`
D. `16 xx 10^(-20)`

Answer

B

Explanation

`AB hArr A^(+) + B^(-), K_(sp) = S^(2)`
`S = sqrt(K_(sp)) = sqrt(4 xx 10^(-10)) = 2 xx 1-^(-5)`.