1.

Amongst the following, the total number of compound soluble in concentrated `NH_(3)` solution is (a) `Ag_(2)CrO_(4)` (b) `Cu(OH)_(2),CuSO_(4)` (c) `PbSO_(3)` ltBrgt (d) `Al(OH)_(3)` (e) `Ni(OH)_(2)` (f) `Zn_(3)(PO_(4))_(2)` (g) `BaSO_(4)` (h) `Bi(OH)_(2)NO_(3)` (i) `Mn(OH)_(2)`.

Answer» Correct Answer - D
(a),(b) and (c) are soluble in sodium hydroxide not in `NH_(3)` (d) Soluble in sodium hydroxide not in `NH_(3)`.
(e) `Ni(OH)_(2)darr(green)+6NH_(3)to[Zn(NH_(3))_(4)]^(2+)("Deep blue colouration"))+2OH^(-)`
(f)
`Zn_(3)(PO_(4))_(2)darr(white)+12NH_(3) to 3[Zn(NH_(3))_(4)]^(2+)+2PO_(4)^(3-)`
(g) Insoluble in `NH_(3)`, soluble appreaciable in boiling concentrated `H_(2)SO_(4)`.
(h) `Bi(OH)_(2)NO_(3)` is insoluble in `NH_(3)`.
(i) Insoluble in `NH_(3)` but soluble in ammonium salts liberating `NH_(3)`.


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