Discussion
The following half cell represents, normal hydrogen electrode (NHE) :
Answer: C
The NHE is Pt | H+ (1M HCl) | H2(g) (1 atm).
The normal hydrogen electrode is the older practical reference: platinised platinum in a one normal (1 N) solution of a strong monoprotic acid, with hydrogen gas at 1 atm bubbling over it. 1 M HCl is 1 N in H+.
The cell with H+ at unit activity is the standard hydrogen electrode (SHE), the thermodynamic definition, which is not the same as a fixed concentration. 1 M H2SO4 is 2 N in H+, and H3PO4 is a weak acid that does not supply 1 M H+.
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