Question

Consider the following relations for emf of an electrochemical cell
$(i)$ EMF of cell = (oxidation potential of anode) - (Reduction potential of cathode)
$(ii)$ EMF of cell = (oxidation potential of anode) + (Reduction potential of cathode)
$(iii)$ EMF of cell = (reduction potential of anode) + (oxidation potential of cathode)
$(iv)$ EMF of cell = (oxidation potential of anode) - (oxidation potential of cathode)
Which of these expressions are correct?

• A. (iii) and (i)
• B. (i) and (ii)
• C. (iii) and (iv)
• D. (ii) and (iv)

Answer 1

Answer: (D)

EMF of a cell = reduction potential of cathode - reduction potential of anode
= reduction potential of cathode + oxidation potential of anode
= oxidation potential of anode - oxidation potential of cathode.