1.

A metallic nitrate (A) on strong heating leaves behind a residue along with liberation of gases. The metallic nitrate on treatment with H_(2)S//H^(+) gives a black precipitate (B)^(-) insoluble in hot dilute nitric acid, but the precipitate dissolves in aquaregia. Compound B is

Answer»

`Ag_(2)S`
`CuS`
`HgS`
`PBS`

SOLUTION :`underset((A))(HG(NO_(3))_(2))rarrHg+NO_(2)+O_(2)`
`darrH_(2)S//H^(+)`
`underset((B))(HgS)`
`Hg(NO_(3))_(2)+NH_(3)+H_(2)OrarrHgO`
`Hg(NH_(2))NO_(3)darr+NH_(4)^(+)`( White ppt of mixed composition)


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