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Q. Solubility product expression of salt $MX_4$ which is sparingly soluble with a solubility $s$ can be given as

Equilibrium

Solution:

$MX_4 \rightleftharpoons \underset{\text{s}}{M^+}+ \underset{\text{4s}}{4X^-}$
$K_{sp} =s \times (4s)^4$
$=256s^5$