The solubility product of a binary weak electrolyte is $4 \times 10^{-10}$ at $298 \ K$. Its solubility in $\text{mol} \ dm^{-3}$ at the same temperature is
- A$4 \times 10^{-5}$
- B$2 \times 10^{-5}$
- C$8 \times 10^{-10}$
- D$16 \times 10^{-20}$
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