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Per NCERT Problem 7.2, in 2Na(s) + H₂(g) → 2NaH(s), the role of hydrogen is which?
ABoth
BReduced
CUnchanged
DOxidised
Answer & Solution
Correct answer: B. Reduced
NCERT Problem 7.2: NaH is Na⁺H⁻; H goes 0 → −1 (gains e⁻) ⇒ reduced. Na is oxidised.
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