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 A isA. `AgNO_(3)`B. `Cu(NO_(3))_(2)`C. `Pb(NO_(3))_(2)`D. `Hg(NO_(3))_(2)`

A metallic nitrate `(A)` on strong heating leaves behind a residue alo

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 A isA. `AgNO_(3)`B. `Cu(NO_(3))_(2)`C. `Pb(NO_(3))_(2)`D. `Hg(NO_(3))_(2)`
Answer» Correct Answer - D `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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