Correctly expressed half-reactions

Question

Correctly expressed half-reactions include which of the following?

I.CrO4 2-+8H+ + 6e-→Cr3+ + 4H2O

II.I- + 6OH- → IO3- + 3H2O + 6e

III.MnO4- + 2H2O + 3e- → MnO2 + 4OH-

A.I only

B.III only

C.I and IIonly

D.II and III only

E.I, II, and III

Answer 1

Hint; The net charges on the reactants side should be equal to that of the products side!!

the answer is D; reactions II and III are expressed correctly