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JEE Main 2025 Apr 7 Shift 1, Chemistry Q19: Isomerism In Co-ordination Compounds

JEE Main2025Apr 7, Shift 1Chemistry
Q.

An octahedral complex having molecular composition Co.5NH.Cl.SO has two isomers A and B. The solution of A gives a white precipitate with AgNO solution and the solution of B gives white precipitate with BaCl solution. The type of isomerism exhibited by the complex is,

  1. A

    Co-ordinate isomerism

  2. B

    Linkage isomerism

  3. C

    Ionisation isomerism

  4. D

    Geometrical isomerism

Solution

The two isomers differ in which anion sits inside the coordination sphere and which sits outside as a free ion:

  • Isomer A: — the free Cl in solution gives a white precipitate of AgCl with AgNO.
  • Isomer B: — the free SO in solution gives a white precipitate of BaSO with BaCl.

This swap of an anion between the coordination sphere and the ionisation sphere is the defining feature of ionisation isomerism.

Option (3).

Concept behind this question

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