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Lesser is the number of unpaired electrons, smaller will be the paramagnetic behavior. As Cr2+, Mn2+, Fe2+ & Ni2+ contains:

1. Cr2+ (3d4) = 4 unpaired electrons
2. Mn2+ (3d5) = 5 unpaired electrons
3. Fe2+ (3d6) = 4 unpaired electrons
4. Ni2+ (3d8) = 2 unpaired electrons

Correct answer: Ni2+ (3d8) = 2 unpaired electrons

Solution

Paramagnetic behavior depends on the number of unpaired electrons. Ni2+ (3d8) has the least number of unpaired electrons (2), making it the least paramagnetic among the given ions.

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