Question

Given the balanced ionic equation representing a reaction:
2A1(s) + 3Cu2+(aq) ==>2A13+(aq) + 3Cu(s)
Which half-reaction represents the reduction that occurs?(I ) Al ==> Al3+ + 3e-
(2) Al3+ + 3e- ==>Al
(3) Cu ==> Cu2+ + 2e-
(4) Cu2+ + 2e- ==>Cu

Answer 1

the answer should be (4)