which of the following element does not show the variable oxidation state?? and why??
a.Fe
b.Mn
c.Cu
d.Zn
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Answer is Zn
Because the electronic config is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 . As inner 3d orbital is completely filled here so it's quite stable to undergo any change in its configuration. So only 4s orbital is active to do any chemical reaction.hence the only possible oxidation state is +2.
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