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Chemical reactions and calculations

Which of the following represents a redox reaction?


(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.

ZnZn2++2e(Oxidation) 2H+2eH2 (Reduction) 

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