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Question

Which of the following ion is paramagnetic?

A
Cu+
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B
Zn2+
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C
O22
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D
Cr3+
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Solution

The correct option is D Cr3+
Ions with unpaired electron is paramagnetic. Elelctronic configuration and unpaired electron in the given ions are:
Cu+:3d10: 0 unpaired electron
Zn2+:3d10: 0 unpaired electron
O22:σ2p2π2p4π2p4: 0 unpaired electron
Cr3+:3d3: 3 unpaired electron
thus option D is correct.

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