What type of reaction is respiration ? Explain.

Metal X was placed in lead nitrate solution. A thin layer of lead metal deposits on metal X. Which is more reactive metal X or lead ? State the type of reaction and give an example of this type.

Explain the different types of double decomposition reactions by giving suitable equations.

Balance these reactions and state what type of reactions they are:

(a) NaNO₃ ⟶ NaNO₂ + O₂

(b) AgNO₃ + Zn ⟶ Zn(NO₃)₂ + Ag

(c) Fe + HCl ⟶ FeCl₂ + H₂

(d) AgNO₃ ⟶ Ag + NO₂ + O₂

(e) NaBr + Cl₂ ⟶ NaCl + Br₂

(f) PbO + C ⟶ Pb + CO₂

(g) KClO₃ ⟶ KCl + O₂

(h) AgNO₃ + HCl ⟶ AgCl ↓ + HNO₃

(i) NH₃ + HCl ⟶ NH₄Cl

(j) N₂ + H₂ ⟶ NH₃