How many electrons are involved in one equivalent of oxidation-reduction?

1 electron is involved.

Explanation:

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In redox reactions, when therer's the necessity to know the involved equivalents, they equal the number of transferred electrons, in this case, since one equivalent is stated, one electron is transferred (involved).

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hi,

the answer is d.indefinite shape but definite volume, let go oogle u out

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it is the most commonly accepted one