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How many electrons are required to balance the following half-reaction?

Au + 4 Cl- ⟶ AuCl4-
A. 2 electrons on the products side

B. 2 electrons on the reactants side

C. 3 electrons on the products side

D. 3 electrons on the reactants side
Please help ASAP!!! :(

1 answer

Au on the left has an oxidation state of 0
Au on the right has a oxidation state of 3+
So change in electrons must be .........
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