Question

A standard hydrogen electrode has zero electrode potential because (A) hydrogen is easiest to oxidise

Answer 1

this electrode potential assumed to hydrogen atom have only one electrons hydrogen is a lightst element
this electrode potential is assumed to be zero

The standard potential of hydrogen electrode is assumed to be zero at all temperature.

The Standard hydrogen electrode (abbreviated SHE), is a redox electrode which forms the basis of the thermodynamic scale of oxidation-reduction potentials. Its absolute electrode potential is estimated to be 4.44 ± 0.02 V at 25 °C, but to form a basis for comparison with all other electrode reactions, hydrogen's standard electrode potential (E0)(E0) is declared to be zero volts at all temperatures.