Which one of the following statements is correct?

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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.
This question was previously asked in
UPSC CDS-2 – 2016
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Hydrogen can exist in different chemical environments where it exhibits more than one oxidation number.
The oxidation number for hydrogen is typically +1 when bonded to nonmetals (e.g., H₂O, HCl, NH₃). However, when bonded to more active metals (forming metal hydrides like NaH, CaH₂), hydrogen is more electronegative than the metal and has an oxidation number of -1. In its elemental form (H₂), the oxidation number is 0.
The oxidation number reflects the hypothetical charge an atom would have in a molecule if all bonds were ionic. The electronegativity difference between hydrogen and the atom it is bonded to determines whether hydrogen takes a positive or negative oxidation state.

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