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JEE Main20262 April 2026Evening ShiftChemistryCoordination CompoundsActual

Which of the following complexes will show coordination isomerism? A. [Ag(NH₃)₂][Ag(CN)₂] B. [Co(NH₃)₆][Cr(CN)₆] C. [Co(NH₃)₆][Co(CN)₆] D. [Fe(NH₃)₆][Co(CN)₆] E. [Co(NH₃)₆][Fe(CN)₆] Choose the correct answer from the options given below:

Options

  1. AB, C and D Only
  2. BB, D and E Only
  3. CA, C and D Only
  4. DC, D and E Only

Correct answer

B. B, D and E Only

Step-by-step solution

Coordination isomerism arises from the interchange of ligands between cationic and anionic entities of different metal ions present in a complex. A. [Ag(NH₃)₂][Ag(CN)₂] : Both the complex cation and anion contain the same metal ion ( Ag^+ ). Interchanging one ligand produces a neutral molecule [Ag(NH₃)(CN)] , and interchanging both ligands yields the identical compound. Thus, it does not show coordination isomerism. B. [Co(NH₃)₆][Cr(CN)₆] : The complex contains different metal ions ( Co³⁺ and Cr³⁺ ). Interchange of

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