JEE Advanced · 2013 · 02 Jun 2013 · Paper 1 · Practical and Analytical Chemistry

Upon treatment with ammoniacal

H_{2} S

, the metal ion that precipitates as a sulfide is

(A) $F e$ (III)
(B) $A l$ (III)
(C) $M g$ (II)
(D) $Z n$ (II)✓ Correct

Answer: (D)

Solution

Ammoniacal

H_{2} S

is used to precipitate Group 4 cations in qualitative analysis. Zinc(II) belongs to this group and precipitates as

Z n S

. Iron(III), aluminum(III), and magnesium(II) do not precipitate with ammoniacal

H_{2} S

under these conditions.

JEE Advanced · 2013 · 02 Jun 2013 · Paper 1 · Single correct option

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