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COMEDK2017Chemistryd and f Block Elements

Which of the following has the maximum number of unpaired d -electrons?

Options

  1. AZn ²⁺
  2. BFe ²⁺
  3. CNi ³⁺
  4. DCu ⁺

Correct answer

B. Fe ²⁺

Step-by-step solution

The electronic configuration of aligned Fe (26) &=1 s² 2 s² 2 p⁶ 3 s² 3 p⁶ 3 d⁶ 4 s² Fe &=1 s² 2 s² 2 p⁶ 3 s² 3 p⁶ 3 d⁶ 4 s⁰ aligned It has four unpaired electrons.

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