Which of the following is the reaction taking place at anode?

(A) 2H_{2 (g)} +O_{2 (g)}   →  2H₂O_(I)
(B) Zn⁺²_(aq) + 2e^–   →   Zn _(s)
(C) Cr_(s)    →    Cr^{+3 (aq)} + 3e^-3
(D) Pb_(s) + Cl_2(g)    →   PbCl_2(s)

Answer: (C) Cr_(s)    →    Cr^{+3 (aq)} + 3e^-3