MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryRedox Reactions/Volumetric AnalysisConcept of Oxidation and Reduction
Which one of the following reaction involves oxidation- reduction?
A.H2 + Br2→ 2HBr✓ Correct
B.NaBr + HCl → NaCl + HBr
C.HBr + AgNO3→AgBr + HNO3
D.2NaOH + H2SO4→ Na2SO4 + 2H2O
Explanation
In a redox reaction, one molecule is oxidised and other molecule is reduced i.e. oxidation number of reactants are changed. 0 0 1 1 2 2 2 -> H Br HBr Here H2 is oxidised and Br2 is reduced, thus it is oxidation-reduction reaction.
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