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Question

Which of the following is a paramagnetic substance?

A
Mg2+
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B
Cu+
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C
Mn7+
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D
Ti2+
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Solution

The correct option is D Ti2+
The configuration of different species are:
Mg2+1s22s22p6
Mn7+[Ar]3d0
Cu+[Ar]3d10
Ti2+[Ar]3d2
Only Ti2+ have two unpaired electron.
Thus, Ti2+ is a paramagnetic in nature.

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