Which is the correctly balanced chemical equation for the reaction of KOH and H2SO4?

1.)OKOH → H2SO4 →K*+504-

2.)2KOH+H2SO4 → K2SO4

3.)O2KOH+H2SO4 →K2SO4 +2H2O

4.)OKOH → H2SO4 → K2504 →H,0