When `H_2S` is passed through acidified zinc sulphate solution, white precipitate of zinc sulphide is not formed.

When H_(2)S gas is passed through ZnCl_(2) solution. ZnS is not precipitated, why?

When H_(2)S gas a passed through an ammonical salt solution X, a slightly white precipitate is formed. The X can be:

When H_(2)S is passed through nitric acid and acidified KMnO_(4) solution the product formed is

When H_(2)S is passed through acidified K_(2)Cr_(2)O_(7) solution, the solution turns :

When SO_2 is passed through a solution of H_2 S in water :

When H_(2)S is passed through an ammonium salt solution X, a white ppt is obtained .The X can be a

An aqueous solution of a substance gives a white percipitate on treatment with dil ,HCI which dissolves on heating .When H_(2)S is passed through the hot acidic solution a black precipitate is obtained .The substances are not :

When SO_(2) is passed through acidic solution of potassium dichromate, then chromium sulphate is formed. Change in valency of chronium is

When zinc granule is dipped into copper sulphate solution, copper is precipitated because :

H_(2)S gas on passing through an alkline solution , forms a white precipitate .The solution contains ions of