Classify the following reactions as combination, decomposition, displacement, precipitation and neutralisation. Also balance the equations.

(a) CaCO₃ (s) $\xrightarrow{\enspace\Delta\enspace}$ CaO (s) + CO₂ (g)

(b) Zn(s) + H₂SO₄ ⟶ ZnSO₄ (s) + H₂ (g)

(c) AgNO₃ (aq) + NaCl (aq) ⟶ AgCl(s) + NaNO₃

(d) NH₃ (g) + HCl (g) ⟶ NH₄Cl (s)

(e) CuSO₄ (aq) + H₂S (g) ⟶ CuS (s) + H₂SO₄ (l)

(f) Zn (s) + CuSO₄ (aq) ⟶ ZnSO₄ (aq) + Cu(s)

(g) Ca(s) + O₂ (g) ⟶ CaO(s)

(h) NaOH + HCl ⟶ NaCl + H₂O

(i) KOH + H₂SO₄ ⟶ K₂SO₄ + H₂O

(a) Decomposition reaction
CaCO₃ (s) $\xrightarrow{\enspace\Delta\enspace}$ CaO (s) + CO₂ (g)

(b) Displacement reaction
Zn(s) + H₂SO₄ ⟶ ZnSO₄ (aq) + H₂ (g)

(c) Precipitation reaction
AgNO₃ (aq) + NaCl (aq) ⟶ AgCl(s) + NaNO₃ (aq)

(d) Combination reaction
NH₃ (g) + HCl (g) ⟶ NH₄Cl (s)

(e) Precipitation reaction
CuSO₄ (aq) + H₂S (g) ⟶ CuS (s) + H₂SO₄

(f) Displacement reaction
Zn (s) + CuSO₄ (aq) ⟶ ZnSO₄ (aq) + Cu(s)

(g) Combination reaction
2Ca(s) + O₂ (g) ⟶ 2CaO(s)

(h) Neutralisation reaction
NaOH + HCl ⟶ NaCl + H₂O

(i) Neutralisation reaction
2KOH + H₂SO₄ ⟶ K₂SO₄ + 2H₂O