1.

Amongst the following, the total number of compounds soluble in concentrated `NH_3` solution is: (A)`Ag_2CrO_4`, (B)`Cu(OH)_2 .CuSO_4`, (C )`PbSO_3` , (D)`Al(OH)_3` , (E)`NI(OH)_2` (F)`Zn_3(PO_4)_2`, (G)`BaSO_4`, (H)`Bi(OH)_2NO_3` , (I)`Mn(OH)_2`

Answer» Correct Answer - 4
(A)`Ag_2CrO_4darr(yellow)+NH_3to[Ag(NH_3)_2]^(+)+CrO_4^(2-)`
(B)`Cu(OH)_2. CuSO_4 darr (blue )+8NH_3 to 2[Cu(NH_3)_4]^(2+)+SO_4^(2-)+2OH^(-)`
(C )`PbSO_3darr(white)+4OH^(-)to[Pb(OH)_4]^(2-)+SO_3^(2-)`
Soluble in sodium hydroxide not in `NH_3`
(D)Soluble in sodium hydroxide not in `NH_3`
(E)`Ni(OH)_2darr(green )+6NH_3to[ni(NH_3)_6]^(2-)`(deep blue colouration ) +`2OH^-`
(F)`Zn_3(PO_4)_2darr(white)+12NH_3to3[Zn(NH_3)_4]^(2-)+2PO_4^(3-)`
(G)Insoluble in `NH_3` , soluble appreciably in boiling concentrated `H_2SO_4`
(H)`Bi(OH)_2NO_3` is insoluble in `NH_3`
(I)Insoluble in `NH_3` but soluble in ammonium salts liberating `NH_3`


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