K--> K2O--> KOH-->KCl-->Cl2-->Hcl-->H2O
K+ O2= K2O K2O + 2NaOH= 2KOH + Na2O KOH+ HCl = KCl + H2O KCl + NaClO4 + H2O = Cl2 + K + NaCl +H2O Cl2 + H2= HCl 2HCl + NaOH= H2O + NaCl