Multiple choice

Arrange the following central metal ions in order of increasing nephelauxetic effect.

a. Co(III) b. Ir(III) c. Fe(III)

  1. a < b < c

  2. a < c < b

  3. b < a < c

  4. c < b < a

  5. c < a < b
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D Correct answer
Explanation

The nephelauxetic effect not only depends upon the ligand type, but also upon the central metal ion. These too can be arranged in order of increasing nephelauxetic effect as follows: Mn(II) < Ni(II) ≈ Co(II) < Mo(II) < Re(IV) < Fe(III) < Ir(III) < Co(III) < Mn(IV).

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