The solubility product of a binary weak electrolyte is `4 xx 10^(-10) " at" 298K`. It's solubility in mol `dm^(-3)` at the same temperature is

Options

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

Answer

D

Explanation

For binary electrolyte the solubility and solubility product relation is `K_(SP) = S.S`.
`S= sqrt(K_(SP)) = sqrt(4 xx 10^(-10)) = 2.10^(-5) mol dm^(-3)`