C-08-Q180mediumsingle_mcqReaction at the cathode in electrolysis of water:a4 HX++4 eX−→2 HX2\ce{4H+ + 4e- -> 2H2}4HX++4eX−b4 OHX−→OX2+2 HX2O+4 eX−\ce{4OH- -> O2 + 2H2O + 4e-}4OHX−cNaX++eX−→Na\ce{Na+ + e- -> Na}NaX++eXdClX−→Cl+eX−\ce{Cl- -> Cl + e-}ClX−