Indicate three differences between valence and oxidation number?

Indicate three differences between valence and oxidation number?
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Ans (i) Valency of an element cannot not be zero but oxidation number can be. (ii) Valency is just a number but oxidation number can be negative or positive. (iii) Valency is the combining capacity whereas oxidation number refers to charge which an atom carry when present in the combined state.
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