Question

Which half-reaction correctly represents reduction?(1) Ag --> Ag+ + e–

(2) F2 --> 2 F– + 2e–
(3) Au3+ + 3e–--> Au
(4) Fe2+ + e– --> Fe3+

Answer 1

Reduction is the gain of electrons (OILRIG, Oxidisation is Loss, Reduction is Gain)
The only half-reaction showing a gain of electrons is (3) Au3+ + 3e- --> Au