what happens when :
sodium reacts with oxygen
sulphur reacts with oxygen
aluminium reacts with dilute hydrochloric acid
1) Sodium reacts with oxygen
2Na + O2 → Na2O2
2) Sulphur reacts with oxygen
S + O2 → SO2
3) Aluminium reacts with dilute hydrochloric acid
2Al + 6HCl → 2AlCl3 + 3H2