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Question

Which metal exhibits more than one oxidation states in their compounds.

A
Na
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B
Mg
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C
Al
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D
Fe
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Solution

The correct option is D Fe
Transition elements show variable state oxidation in their compounds because there is a very small energy difference in between (n1)d and ns orbitals. As a result, electrons of (n1)d orbitals as well as ns-orbitals take part in bond formation.
Iron (Fe) being a transition metal has variable oxidation states.

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