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KCET2026ChemistryCoordination Compounds

How many ions per molecule are produced from the complex [ Co(NH ₃ ) ₆] Cl ₂ in solution?

Options

  1. A6
  2. B4
  3. C3
  4. D2

Correct answer

C. 3

Step-by-step solution

The given complex is [ Co(NH ₃ ) ₆] Cl ₂ . When dissolved in water, the coordination sphere remains intact and does not dissociate, while the counter ions ionize completely. The dissociation reaction is given by: [ Co(NH ₃ ) ₆] Cl ₂ [ Co(NH ₃ ) ₆]²⁺ + 2 Cl ^- This produces 1 complex cation and 2 chloride anions. Total number of ions produced per molecule = 1 + 2 = 3 . Answer: 3

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