When $H_2S$ gas is passed into a certain solution,it reacts to form a white precipitate. The solution referred to contains ions of

$25 \ mL$ of silver nitrate solution $(1 \ M)$ is added dropwise to $25 \ mL$ of potassium iodide $(1.05 \ M)$ solution. The ion$(s)$ present in very small quantity in the solution is/are $........$.

The solubility of $AgCl$ is least in which of the following solutions?

$A$ mixture containing $Cu^{2+}$ and $Ni^{2+}$ can be separated for identification by

When $HCl$ gas is passed through a saturated solution of $BaCl_2$,a white precipitate is obtained. This is due to:

When $H_2S$ gas is passed through a solution containing $HCl$,it precipitates the cations of the second group of qualitative analysis but not those belonging to the fourth group. This is because: