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Which one of the following statements is correct?

The oxidation number for hydrogen is always zero.
The oxidation number for hydrogen is always + 1.
The oxidation number for hydrogen is always -1.
Hydrogen can have more than one oxidation number.

Correct Answer: Hydrogen can have more than one oxidation number.

Explanation:

Hydrogen has two possible oxidation numbers: +1 and -1.

-1 in case of hydrides.

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