Solubility of $MX_2$ – type electrolytes is $0.5 \times 10^{–4}$ Mole/lit. then find out $K_{sp}$ of elctrolytes : -

Question

( A ) $5 \times10^{–12}$
( B ) $25\times 10^{–10}$
( C ) $1 \times 10^{–13}$
( D ) $5 \times 10^{–13}$