Question

# Which of the following does not show variable valency?

A
Mn
B
Fe
C
Zn
D
Cr

Solution

## The correct option is B $$Zn$$The electronic configuration of zinc is $$[Ar]3d^{10}4s^{2}$$.It can only lose two electrons from the $$4s$$ orbital and show $$+2$$ oxidation state. It does not show variable valency. However, all other transition metals like $$Mn,\ Fe,\ Cr$$ have partially filled $$d$$ orbitals and hence, show variable valency.Option C is correct.ChemistryNCERTStandard XII

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