Complete and balance the following chemical equations:

(a) N₂ + O₂ ⟶

(b) H₂S + Cl₂ ⟶

(c) Na + H₂O ⟶

(d) NaCl + AgNO₃ ⟶

(e) Zn + H₂SO₄ (dil.) ⟶

(f) FeSO₄ (aq) + NaOH (aq) ⟶

(g) Pb(NO₃)₂ $\xrightarrow{\enspace\Delta\enspace}$

(h) BaCl₂ (aq) + H₂SO₄ (aq) ⟶

Fill in the blanks:

(a) A reaction in which two or more substances combine to form a single substance is called a …………… reaction.

(b) A …………… is a substance which changes the rate of a chemical reaction without undergoing a chemical change itself.

(c) The formation of gas bubbles in a liquid during a reaction is called …………… .

(d) The reaction between an acid and a base is called …………… .

(e) Soluble bases are called …………… .

(f) The chemical change involving iron and hydrochloric acid illustrates a …………… reaction.

(g) In the type of reaction called …………… two compounds exchange their positive an negative radicals respectively.

(h) A catalyst either …………… or …………… the rate of a chemical change but itself remains …………… at the end of the reaction.

(i) The chemical reaction between hydrogen and chlorine is a …………… reaction.

(j) When a piece of copper is added to silver nitrate solution, it turns …………… in colour.

Define:

(a) Precipitation

(b) Neutralization

(c) Catalyst

Explain the following types of chemical reactions giving two examples for each of them:

(a) combination reaction

(b) decomposition reaction

(c) displacement reaction

(d) double displacement reaction