Identify the incorrect statement:
1) Silicon reacts with NaOH (aq) in the presence of air to give Na2 SiO3 and H2O.
2) Cl2 reacts with excess of NH3 to give N2 and HCl.
3) Br2 reacts with hot and strong NaOH solution to form NaBr, NaBrO3 and H2O.
4) Ozone reacts with SO2 to give SO3 .
