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Identify the diamagnetic octahedral complex ions from below: A. [Mn(CN)6]3− B. [Co(NH3)6]3+ C. [Fe(CN)6]4− D. [Co(H2O)3F3] Choose the correct answer from the options given below. (1) B and D only (2) B and C only (3) A and C only (4) A and D only

1. B and D only
2. B and C only
3. A and C only
4. A and D only

Correct answer: B and C only

Solution

The correct options are B and C because both [Co(NH3)6]3+ and [Fe(CN)6]4− have all their electrons paired, making them diamagnetic. In contrast, [Mn(CN)6]3− and [Co(H2O)3F3] contain unpaired electrons, which results in paramagnetism.

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