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Redox Reactions
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13/11/2021 11:45 am
Topic starter
Which of the following represents a redox reaction?
(a) NaOH + HCl → NaCl + H2O
(b) BaCl2 + H2SO4 → BaSO4 + 2HCl
(c) CuSO4 + 2H2O → Cu(OH)2 + H2SO4
(d) Zn + 2HCl → ZnCl2 + H2
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13/11/2021 11:53 am
Correct answer: d) Zn + 2HCl → ZnCl2 + H2
Explanation:
(a) and (b) are neutralisation reactions. The oxidation state of Cu is +2 in both reactant and product, and SO42- ion does not change. In option (d) is a redox reaction.
Zn → Zn2+ + 2e- (Oxidation)
2H+ + 2e- → H2 (Reduction)