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As per your syllabus, the oxidation number of an atom in any element in its FREE / UNCOMBINED form (e.g. O₂, P₄, S₈) is which?
A−1
B0
CVariable
D+1
Answer & Solution
Correct answer: B. 0
syllabus rule 1: free element ⇒ ox.
no. = 0. Applies to H₂, O₂, Cl₂, O₃, P₄, S₈, metals.
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