Which half-reaction represents reduction?

Question

Choose one answer.
a. Cu → Cu^+2 + 2e-
b. Fe^+2 → Fe^+3 + 1e-
c. Ag^+1 + 1e- → Ag
d. Al → Al^+3 + 3e-

Answer 1

Remember the definitions.
Oxidation is the loss of electrons.
Reduction is the gain of electrons.

The mnemonic for this is LEO the lion goes GRRR. LEO---loss electrons oxidation. If you know that you know reduction is the opposite.

Answer 2

56j5