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Which of the following does not represent the correct order of the properties indicated?

1. Ni2+ > Cr2+ > Fe2+ > Mn2+ (size)
2. Sc > Ti > Cr > Mn (size)
3. Mn2+ > Ni2+ > Co2+ > Fe2+ (unpaired electron)
4. Fe2+ > Co2+ > Ni2+ > Cu2+ (unpaired electron)

Correct answer: Fe2+ > Co2+ > Ni2+ > Cu2+ (unpaired electron)

Solution

Option D is incorrect because the number of unpaired electrons decreases as we move from Fe2+ to Cu2+ in the d-block due to increasing electron pairing in the d-orbitals.

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