$A$ nitrate when mixed with common salt gives a white precipitate which is soluble in dilute $NH_4OH$. It is the nitrate of

Concentrated aqueous $NaOH$ can separate a mixture of

Yellow ammonium sulphide solution is a suitable reagent for the separation of

Concentrated aqueous sodium hydroxide can separate a mixture of

$A$ solution is prepared by mixing a concentrated solution of $Co(NO_3)_2$ with a concentrated solution of $NaNO_2$ in $50\%$ acetic acid. $A$ solution of a salt containing metal $M$ is added to the mixture, and a yellow precipitate is formed. Metal $M$ is:

In qualitative analysis,in order to detect $II$ group basic radicals,$H_2S$ gas is passed in the presence of dilute $HCl$ to: