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Which of the following complexes is diamagnetic?

1. Ni2+ → 3d8 = 1↓ 1↓ 1↓ 1↓
2. Ni2+ → 3d8 = 1↑ 1↑ 1↑ 1↑
3. Ni2+ → 3d8 = 1↓ 1↓ 1↑ 1↑
4. Ni2+ → 3d8 = 1↑ 1↑ 1↓ 1↓

Correct answer: Ni2+ → 3d8 = 1↓ 1↓ 1↓ 1↓

Solution

A diamagnetic complex has all electrons paired. Option A shows all paired electrons in the 3d8 configuration, making it diamagnetic.

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