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»


Solution :(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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