Question

What product(s) forms at the cathode in the electrolysis of an aqueous solution of k2so4?

Answer 1

Catod(-)
K⁺
2H20 +2e⁻ ---> H2 +2OH⁻

We can also say, that
K⁺ +OH⁻ +H2  = KOH +H2   
At the cathode KOH and H2 are formed.