Question

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!!! :(

Answer 1

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 .........