JEE Main · 2022 · 24 Jun 2022 · Shift 1 · Practical and Analytical Chemistry

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During the qualitative analysis of salt with cation y²⁺, addition of a reagent (X) to alkaline solution of the salt gives a bright red precipitate. The reagent (X) and the cation (y²⁺) present respectively are:

(A)Dimethylglyoxime and Ni²⁺✓ Correct
(B)Dimethylglyoxime and Co²⁺
(C)Nessler's reagent and Hg²⁺
(D)Nessler's reagent and Ni²⁺

Answer: (A)

Solution

Dimethylglyoxime (DMG) reacts with Ni²⁺ ions in alkaline solution to form a bright red precipitate of [Ni(DMG)₂] complex. This is a characteristic test for nickel ions. The reaction is: Ni²⁺ + 2DMG⁻ → [Ni(DMG)₂]↓ (bright red precipitate). Cobalt with DMG gives a brown complex, not red.

JEE Main · 2022 · 24 Jun 2022 · Shift 1 · Single correct option

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