The chlor-alkali process produces chlorine, Cl₂(g), in large quantities. What other industrially important substances are produced in this process?
1) NaOH(aq), H2(g)
2) H2(g), O2(g)
3) Hg(l), NaCl(s)
4) Na(s), O2(g)
5) Na(s), H2(g)