A standard hydrogen electrode has a zero potential because:A) Hydrogen can be most easily oxidisedB) Hydrogen has only one electronC) The electrode potential is assumed to be zeroD) Hydrogen is the lightest element

The correct answer is C) The electrode potential is assumed to be zero.

In the context of electrochemistry, the standard hydrogen electrode (SHE) is used as a reference electrode with a defined electrode potential of exactly 0 volts at all temperatures. This choice is arbitrary and serves as a reference point for measuring the electrode potentials of other half-cells. So, the reason the standard hydrogen electrode has a zero potential is because it is defined as such, rather than any intrinsic property of hydrogen itself.