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JEE Main · 2024 · 29 Jan 2024 · Shift 2 · Practical and Analytical Chemistry

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A reagent which gives brilliant red precipitate with Nickel ions in basic medium is
  1. (A)sodium nitroprusside
  2. (B)neutral
  3. (C)meta-dinitrobenzene
  4. (D)dimethyl glyoxime✓ Correct

Answer: (D)

Solution

Nickel(II) ions in basic (ammoniacal) medium react with dimethylglyoxime to form the square-planar chelate bis(dimethylglyoximato)nickel(II):

This complex precipitates as a brilliant (rosy) red solid and is the standard confirmatory test for nickel.

Sodium nitroprusside tests for sulfide ion (giving a violet colour), neutral tests for phenols (giving a violet colour), and meta-dinitrobenzene is not a standard qualitative reagent for any cation.

Dimethylglyoxime is the reagent that gives the brilliant red precipitate with nickel ions.

JEE Main · 2024 · 29 Jan 2024 · Shift 2 · Single correct option

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