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It is the zinc that gets reduced, and the magnesium that gets oxidised. This is because zinc has the higher reduction potential of -0,76 V, compared to magnesiums -2,37 V.

The oxidation half cell therefore becomes Mg (s) --> Mg2++ 2e-

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Q: What is the oxidation half reaction of mgs plus zncl2aq mgcl2aq plus zns?
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