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Manipal MET2011Chemistryd and f Block Elements

Chloride of which of the following element is coloured?

Options

  1. AHg
  2. BAg
  3. CCo
  4. DZn

Correct answer

C. Co

Step-by-step solution

In CoCl ₃, Co is in +3 state Co ³⁺=1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 3 d^6, 4 s^ 4 unpaired electrons, so it will be coloured.

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