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Q.

The metal ion which contains unpaired electrons is

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a

Yb2+

b

Lu3+

c

Ce3+

d

La3+

answer is C.

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Detailed Solution

Yb2+, Lu3+ have Xe 4f14 configuration (n=0).La3+ has Xe configuration (n=0).Ce3+ has Xe 4f1 configuration (n=1).
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