Analytical ChemistryHard

Question

A metal salt solution when treated with dimethyl glyoxime and NH4OH gives a rose red complex. The metal is -

Options

A.Ni
B.Ba
C.Al
D.Zn

Solution

Zn2+ + 2NH4OH →  Zn(OH)2 ↓ (white) + 2NH4+ ; Zn(OH)2 + 4NH4OH → Zn(NH3)4 + 6H2O
Zn2+ + S2- →  ZnS (white)

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