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An atom of a free uncombined element has an oxidation number of:
AOne
BFour
CNine
DZero
Answer & Solution
Correct answer: D. Zero
1. Hydrogen gas and ozone are examples.
2. So are sodium, magnesium and sulphur.
3. The oxidation number is zero.
_Source: NCERT Class 11 Chemistry, Unit 7 'Redox Reactions'_
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