Multiple choice

Which one of the following transition metal ions is expected to form coloured complexes?

  1. Mn2+
  2. Fe3+
  3. Zn2+

Select the correct answer using codes given below:

  1. 1 and 2

  2. 1 and 3

  3. 2 and 3

  4. 1, 2 and 3

  5. None
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A Correct answer
Explanation

Mn: 3d54s2 Mn2+: 3d5 In Mn2+ d orbitals are not completely filled, so it is expected to form coloured complexes.

Fe: 3d64s2 Fe3+: 3d5 In Fe3+ d orbitals are not completely filled, so it is expected to form coloured complexes.

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