When an element is more reactive than hydrogen, what will be produced at the cathode?

When an element is more reactive than hydrogen, it will not be reduced at the cathode during electrolysis. Instead, hydrogen ions from the solution will be preferentially reduced to form hydrogen gas. This occurs because the reactivity series indicates that the more reactive elements have a stronger tendency to remain in their ionic form rather than getting deposited as solid metal. Therefore, when electrolysis takes place in a solution containing a more reactive element, hydrogen is produced at the cathode instead of the metal itself.

In this context, the other choices are not applicable. If the element were less reactive than hydrogen, it could potentially be deposited as a solid at the cathode. The mention of producing any other gas would not reflect the typical reactions happening at the cathode in this scenario either. Lastly, the phrase "no reaction occurs" doesn't fit, as there is a clear reaction where hydrogen gas is formed.