Cation analysis

Upon treatment with ammoniacal $\ce{H2S}$, the metal ion that precipitates as a sulfide is

The precipitate P contains

The coloured solution S contains

For the given aqueous reactions, which of the statement(s) is (are) true?

The metal rod M is

The compound N is

The final solution contains

Passing $\ce{H2S}$ gas into a mixture of $\ce{Mn^{2+}}$, $\ce{Ni^{2+}}$, $\ce{Cu^{2+}}$ and $\ce{Hg^{2+}}$ ions in an acidified aqueous solution precipitates

The compound Y is

The compound Z is

A solution of colourless salt H on boiling with excess NaOH produces a non-flammable gas. The gas evolution ceases after sometime. Upon addition of Zn dust to the same solution, the gas evolution restarts. The colourless salt(s) H is (are)

A solution of a metal ion when treated with KI gives a red precipitate which dissolves in excess KI to give a colourless solution. Moreover, the solution of metal ion on treatment with a solution of cobalt(II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ion is