Which of the following does not show variable valency?
1) Iron
2) Silver
3) Gold
4) Copper
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Explanation:
The electronic configuration of zinc is [Ar]3d104s2.
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.
hope this will be help you
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