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Q.

The element which has half-filled d-orbitals in its ‘+1’ oxidation state is

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a

Mn

b

Cr

c

Zn

d

Fe

answer is B.

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Detailed Solution

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Chromium has the highest melting point because it has a half-filled and very stable d-orbital and these unpaired electrons form strong internal metallic bonds which are difficult to break. It can loose its 4s electron and form Cr+1, which has 3d5 configuration.

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