Long answers

1) Combination: A + B → AB, e.g. 2H₂ + O₂ → 2H₂O.
2) Decomposition: AB → A + B, e.g. 2HgO → 2Hg + O₂.
3) Displacement: A + BC → AC + B, e.g. Zn + CuSO₄ → ZnSO₄ + Cu.
4) Double displacement: AB + CD → AD + CB, e.g. AgNO₃ + NaCl → AgCl↓ + NaNO₃.
Many of these can also be redox if electrons are transferred.

Board answers score better when each type has a labelled equation.

Oxidation: gain of oxygen / loss of hydrogen / loss of electrons.
Reduction: loss of oxygen / gain of hydrogen / gain of electrons.
In 2H₂S + SO₂ → 3S + 2H₂O, H₂S loses hydrogen (oxidised) and SO₂ loses oxygen (reduced). Electrons move from sulphur in H₂S toward sulphur in SO₂.

Name the oxidising agent (the one that gets reduced) in the last line.

Acids produce H⁺ (or H₃O⁺) in water, taste sour, turn blue litmus red — e.g. lemon juice / HCl.
Bases produce OH⁻, feel soapy, turn red litmus blue — e.g. soap solution / NaOH.
They neutralise each other to give salt and water.

Mention one strong and one weak example if the question has marks for that.