21. The correct mathematical expression for finding the molar solubility $(s)$ of $\mathrm{Sn(OH)_2}$ is:
(A) $2s^{2} = K_{\mathrm{sp}}$
(B) $4s^{2} = K_{\mathrm{sp}}$
(C) $108s^{5} = K_{\mathrm{sp}}$
(D) $4s^{3} = K_{\mathrm{sp}}$

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