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JIPMER2010ChemistryCoordination Compounds

The complex ion which has no d -electrons in the central metal atom is

Options

  1. A[ MnO ₄ ]⁻
  2. B[ Co ( NH ₃ )₆ ]³⁺
  3. C[ Fe ( CN )₆ ]³⁻
  4. D[ Cr ( H ₂ O )₆ ]³⁺

Correct answer

A. [ MnO ₄ ]⁻

Step-by-step solution

In [ MnO ₄ ]⁻ , the oxidation state of Mn is +7 . aligned Mn (25) & =[ Ar ] 3 d^5 4 s^2 Mn ⁷⁺ & =[ Ar ] aligned Thus, in [ MnO ₄ ]⁻ no d -electron is present.

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