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Q.

Among the following the incorrect statement about transition metals is 

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a

With increase in number of unpaired electrons melting point increases 

b

They show variable oxidation states

c

Cr, Mo and W have high melting points

d

Mn3+ is more stable than Mn2+

answer is C.

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Detailed Solution

The valence electronic configuration of Mn is 3d5 4s2. After losing two electrons, Mn becomes Mn2+ and achieves a half-filled stable configuration.

This means that Mn2+ is more stable than Mn3+.

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