Which statement correctly describes the standard hydrogen electrode (SHE)?

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The standard hydrogen electrode (SHE) is defined as a platinum electrode immersed in a 1.0 mol/L H⁺(aq) solution at 298 K, with hydrogen gas at a partial pressure of 100 kPa bubbled through the solution. Platinum is used because it is chemically inert and does not participate in the redox reaction. The half-reaction is 2H⁺(aq) + 2e⁻ → H₂(g). By international convention, the SHE is assigned a standard reduction potential of exactly 0.00 V, and all other electrode potentials are measured relative to this reference. Option A correctly describes all components of the SHE: the platinum electrode, the 1.0 mol/L H⁺ concentration, the temperature of 298 K, and the hydrogen gas pressure of 100 kPa.

Describe the standard hydrogen electrode.

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