When $H_2S$ gas is passed through a mixture containing $Mn^{2+}$,$Ni^{2+}$,$Cu^{2+}$,and $Hg^{2+}$ ions in an acidic aqueous solution,which of the following will precipitate?

Arrange the following in increasing order of solubility product $(K_{sp})$: $Ca(OH)_2, AgBr, PbS, HgS$

$A$ 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?

What is the solubility product $(K_{sp})$ of a binary sparingly soluble salt $BA$ if a $100 \text{ mL}$ saturated solution of the salt contains $10^{-4} \text{ moles}$ at room temperature?

The solubility product of $PbCl_2$ at $298 \ K$ is $3.2 \times 10^{-5}$. What is its solubility in $mol \ dm^{-3}$?

Solubility of a salt $A_2B_3$ is $1 \times 10^{-3} \ mol \ dm^{-3}$. What is the value of its solubility product?