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»


Solution :(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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