Mg + Cu2+ —> Mg2+ + Cu a) why is this a redox reaction?

b) identify the oxidizing agent. Give reason for your answer

answer any of them you want please

Explanation:

Since the oxidation state of Mg is changed to +2 from 0, it is oxidized. (as it is increased)

Similarly, oxidation state of Cu is changed to 0 from +2, it is reduced. (as it is decreased)

Since oxidation & reduction occur at the same time, it is redox reaction.

As Mg is being oxidized, other one must be the oxidizing agent.

Cu is the oxidizing agent

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the answers would be

the first one and the second one