1. SO2 is a reducing agent, O2 is an oxidizing agent. Therefore we have a reduction-oxidation reaction.
2. Al2(SO4)3 is an acid and Ca(OH)2 is a base, therefore we have a neutralization reaction.
3. CH2 is fuel and O2 is an oxidizing agent, here we have a combustion reaction.
4. AgNO3 is an oxidizing agent, Mg is a reducing agent. Therefore we have a reduction-oxidation reaction.
5. Ba(NO3)2 is a salt or we can classify it as a base and H3PO4 is an acid, so it will be a neutralization reaction.
6.