Q.

All electrode potentials are measured with respect to which reference electrode?

A. hydrogen electrode
B. platinum electrode
C. calomel electrode
D. hydrogen absorbed on platinum electrode
Answer» D. hydrogen absorbed on platinum electrode
Explanation: All electrode potentials are measured with respect to a reference electrode, usually that of hydrogen absorbed on platinum black. Thus, considering potential of hydrogen absorbed on platinum electrode to be zero, other all have positive of negative potentials.
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