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JEE Advanced 2025 Paper 2, Chemistry Section 1 Q1: Bonding Of Co-ordination Compounds

JEE Advanced2025Paper 2Chemistry Section 1
Q.

During sodium nitroprusside test of sulphide ion in an aqueous solution, one of the ligands coordinated to the metal ion is converted to

  1. A

    NOS

  2. B

    SCN

  3. C

    SNO

  4. D

    NCS

Solution

Sodium nitroprusside is Na[Fe(CN)(NO)]. In the test, sulphide ion attacks the nitrosyl (NO) ligand coordinated to iron, converting it into the thionitrosyl-type ligand NOS, and producing the characteristic purple solution:

Na[Fe(CN)(NO)] + NaS Na[Fe(CN)(NOS)] (purple)

Option (A) is correct.

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