If standard reduction potential of four electrodes A, B, C, D are +2 5 V , +3 0 V , -2 0 V and -1 5 V respectively. When is the standard emf of cell maximum?

MHT CET 2026 Chemistry question

If standard reduction potential of four electrodes A, B, C, D are , , and respectively. When is the standard emf of cell maximum?

(A)'A' is anode and 'B' is cathode
(B)'B' is anode and 'D' is cathode
(C)'C' is anode and 'B' is cathodeCorrect
(D)'B' is anode and 'C' is cathode

Answer: (C)

Solution

(both as reduction potentials). The cell emf is maximum when the electrode with the highest reduction potential is the cathode and the electrode with the lowest reduction potential is the anode. The highest value is B ($+3.0\

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Question ID VK-100264