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JEE Main 2025 Apr 2 Shift 2, Chemistry Q5: Principles Of Qualitative Analysis

JEE Main2025Apr 2, Shift 2Chemistry
Q.

Formation of , a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate extract of salt indicates the presence of :

  1. A

    Sodium ion

  2. B

    Sulphate ion

  3. C

    Sulphide ion

  4. D

    Sulphite ion

Solution

The sodium fusion (Lassaigne) extract is tested for sulphur by adding freshly prepared sodium nitroprusside, . Sulphide ion in the extract attaches to the nitrosyl nitrogen to form an intensely violet/purple complex:

The appearance of this purple colour is therefore diagnostic of ion (sulphide).

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