Standard Hydrogen Electrode MCQ - Practice Questions & Answers

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Standard Hydrogen Electrode

A hydrogen electrode in which pressure of hydrogen gas is maintained at 1 atm and the concentration of H⁺ ions in the solution is 1M, is called a standard hydrogen electrode (SHE).

$\begin{array}{ll}{\text {SHE half reaction }} & {\text {Electrode potential }} \\ {\mathrm{H}_{2} \rightarrow 2 \mathrm{H}^{+}+2 \mathrm{e}^{-}} & {0.0 \mathrm{V}(\text {Anode})} \\ {2 \mathrm{H}^{+}+2 \mathrm{e}^{-} \rightarrow \mathrm{H}_{2}} & {0.0 \mathrm{V}(\text {Cathode})}\end{array}$

The emf of a standard hydrogen electrode is taken as 0.00 V at all temperatures.
It is a reversible electrode.
It is used as a primary reference electrode.
Potentials of other species can be calculated by conducting a cell with SHE as one of the electrodes and then calculating the potential difference by various methods.

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