Which of the following substances is insoluble in acetic acid?

The solubility product expression for $Ca_3(PO_4)_2$ is represented as

The solubility of $AgCl_{(s)}$ with solubility product $1.6 \times 10^{-10}$ in $0.1 \ M \ NaCl$ solution would be

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?

The $K_{sp}$ of $Mg(OH)_2$ is $1 \times 10^{-12}$. $0.01 \ M \ MgCl_2$ will show precipitation in a solution of $pH$ greater than:-

$A$ solution which is $10^{-3} \ M$ each in $Mn^{2+}, Fe^{2+}, Zn^{2+},$ and $Hg^{2+}$ is treated with $10^{-16} \ M$ sulphide ion. If $K_{sp}$ of $MnS, FeS, ZnS,$ and $HgS$ are $10^{-15}, 10^{-23}, 10^{-20},$ and $10^{-54}$ respectively,which one will precipitate first?