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  9. Q65

MPSC State Service 2020 · GS · Question 65 of 97

The number of unpaired electrons in tetrahedral [Ni (CO)4] complex is ________.

Chemistry

  1. A0Correct
  2. B1
  3. C2
  4. D3

Answer: A. 0

Explanation

Ni(CO)4 is a tetrahedral Ni(0) complex with strong-field CO ligands; all electrons are paired, so unpaired count is 0.

Source: MPSC Rajyaseva Prelims 2020 – GS Paper I (Set D), official paper

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