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Question

Which of the following does not show variable valency?


A
Mn
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B
Fe
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C
Zn
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D
Cr
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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.

Chemistry
NCERT
Standard XII

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