The solubility product of $Mg(OH)_2$ is $1 \times 10^{-11}$. At what $pH$ will $Mg(OH)_2$ start to precipitate from a $0.1 \, M \, Mg^{2+}$ solution?

Which of the following is insoluble in water?

$Cu^{2+}$ and $Cd^{2+}$ are distinguished through the formation of complexes $[Cu(CN)_4]^{3-}$ and $[Cd(CN)_4]^{2-}$ when $H_2S$ gas is passed. Which of the following is correct?

$M_{3}A_{2}$ is a sparingly soluble salt of molar mass $y \text{ g mol}^{-1}$ and solubility $x \text{ g L}^{-1}$. The ratio of the molar concentration of the anion $(A^{3-})$ to the solubility product of the salt is

Which of the following substances is insoluble in acetic acid $(CH_3COOH)$?

Equal volumes of $0.02 \ M$ $CaCl_2$ and $0.00004 \ M$ $Na_2SO_4$ solutions are mixed. Will a precipitation of $CaSO_4$ occur? $(K_{sp} = 2.4 \times 10^{-5})$