UPSC 2016 CDS II GK Paper

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Question : 27 of 120

Marks: +1, -0

Which one of the following statements is correct?

[2016 CDS-II]

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

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