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JEE Main levelSingle correct optionDifficulty 1 of 3ec25

Which statement about the standard hydrogen electrode (SHE) is incorrect?

AIts potential is defined as zero at all temperatures
BPlatinum black provides the surface for $H X_{2} 2 H X^{+} + 2 e X^{-}$
CPlatinum is consumed in the electrode reaction
DIt can act as either anode or cathode depending on the other half cell

Answer: C

Platinum is an inert conductor and catalyst; it is not consumed. The SHE uses

H X_{2}

at 1 bar and

a_{H X^{+}} = 1

and its potential is zero by convention at every temperature.

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