For the precipitation of $AgCl$ by $Ag^{+}$ ions and $HCl$,which of the following is true?

The solubility of $CaF_2$ is $s$ moles/litre. Then its solubility product is ....

Two salts $A_2X$ and $MX$ have the same value of solubility product of $4.0 \times 10^{-12}$. The ratio of their molar solubilities i.e. $\frac{S(A_2X)}{S(MX)} = \dots$ (Round off to the Nearest Integer).

The solubility of an electrolyte of type $MX_2$ is $0.5 \times 10^{-4} \ mol/L$. Find the $K_{sp}$ of the electrolyte.

The solubility product constants $(K_{sp})$ of $CuS$,$Ag_2S$,and $HgS$ are $10^{-37}$,$10^{-44}$,and $10^{-54}$ respectively. The order of their solubility is:

On passing $H_2S$ gas through a solution of $Cu^{2+}$ and $Zn^{2+}$ ions,$CuS$ is precipitated first because