Which compound does not dissolve in hot dilute $HNO_3$?

If the concentration of $CrO_4^{2-}$ ions in a saturated solution of silver chromate is $2 \times 10^{-4} \ M$,the solubility product of silver chromate will be:

When equal volumes of the following solutions are mixed,precipitation of $AgCl$ $(K_{sp} = 1.8 \times 10^{-10})$ will occur only with:

What is the correct representation of the solubility product of $Ag_2CrO_4$?

If the concentration of $Cr_2O_7^{2-}$ in a saturated solution of $Ag_2Cr_2O_7$ is $6.5 \times 10^{-5} \ M$ at a constant temperature,calculate the value of $K_{sp}$ for $Ag_2Cr_2O_7$.

Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$Pb(AcO)_2 + H_2S \longrightarrow PbS \downarrow + 2AcOH$