Column-I Column-II (A) Precipitate with KCN, which is soluble in excess of reagent. (P) Fe2+ (B) Precipitate with NaOH & NH4OH, which is insoluble in both reagents in excess. (Q) Hg2+ (C) Coloured ppt. with KI, which is soluble in excess of reagent (R) Pb2+ (D) Black ppt. with H2S, which is soluble in hot & dil. HNO3 (S) Ag+ (T) Na+

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Question

Column-I	Column-II
(A) Precipitate with KCN, which is soluble in excess of reagent.	(P) Fe²⁺
(B) Precipitate with NaOH & NH₄OH, which is insoluble in both reagents in excess.	(Q) Hg²⁺
(C) Coloured ppt. with KI, which is soluble in excess of reagent	(R) Pb²⁺
(D) Black ppt. with H₂S, which is soluble in hot & dil. HNO₃	(S) Ag⁺
	(T) Na⁺

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(A) (P) Fe²⁺ + 2KCN → Fe(CN)₂↓ $\underset{excess}{\overset{4 KCN}{\to}}$ K₄[Fe(CN)₆]

Brown ppt. Pale yelllow colouration

(S) Ag⁺ + KCN → AgCN ↓ $\overset{KCN}{\to}$ K[Ag(CN)₂]

white ppt. soluble complex

(B) (P) Fe(OH)₂ is not soluble in both excess NaOH & excess NH₄OH solution

(Q) HgO not soluble in excess NaOH & excess NH₄OH solution

(C) (Q) Hg²⁺ + 2KI → HgI₂↓ (scarlet red)

HgI₂ $\overset{2 KI}{\to}$ K₂[HgI₄]

scarlate red ppt soluble

(R) Pb²⁺ + 2KI →PbI₂ ↓ + 2K⁺

PbI₂↓+ 2KI → K₂[PbI₄]

Yellow ppt. excess soluble

(D) (R) Pb²⁺ + H₂S → PbS↓ + 2H⁺

black ppt.

3PbS + 8HNO₃→ 3Pb(NO₃)₂ + 2NO + 3S + 4H₂O

(S) 2Ag⁺ + H₂S → Ag₂S↓+ 2H⁺

black ppt.

3Ag2S↓ + 8HNO₃ → AgNO₃ + 2NO + 3S + 4H₂O

Black ppt.