Question

Standard hydrogen electrode (SHE) is a ______.

Options

• primary reference electrode

• secondary reference electrode

• metal - sparingly soluble salt electrode

• metal - metal ion electrode

Answer 1

Standard hydrogen electrode (SHE) is a primary reference electrode.

Explanation:

Standard hydrogen electrode (SHE) is primary reference electrode. SHE is represented by Pt(s)| H₂(g)| H⁺ (aq), is assigned a zero potential at all temperatures corresponding to reaction.

$$\mathrm{H}{\phantom{A}}^{+}(\mathrm{aq})+\mathrm{e}{\phantom{A}}^{-}⟶\frac{1}{2}\mathrm{H}{\phantom{A}}_2(\mathrm{g})$$