Question

What is the oxidation no of in 2H2O

Answer 1

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Oxidation numbers are assigned to individual atoms within a molecule. So, the fact that there are 2H2O in an equation doesn't affect the oxidation numbers of the individual atoms. So, in H2O, whether you have one molecule or a bathtub full, H has an oxidation number of +1 and O has an oxidation number of -2.

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Answer 2

the oxidation number of O is -2