Which of the following represents a redox reaction?

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NaOH+HCl⟶NaCl+H2O

BaCl2+H2SO4⟶BaSO4+2HCl

CuSO4+2H2O⟶Cu(OH)2+H2SO4

Zn+2HCl⟶ZnCl2+H2

answer is D.

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Detailed Solution

(1) and (2) are neutralisation reactions.(3) The oxidation state of Cu is +2 in both reactant and product, and SO42− ion does not change. So it is none reaction.(4) It is a redox reaction.Zn⟶Zn2++2e−(Oxidation) 2H⊕+2e−⟶H2 (Reduction)

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