Chemistry
State the type of reactions each of the following represent and balance the ones that are not balanced.
(a) Cl2 + 2KBr ⟶ 2KCl + Br2
(b) NaOH + HCl ⟶ NaCl + H2O
(c) 2HgO ⟶ 2Hg + O2 ↑
(d) Fe + CuSO4 ⟶ FeSO4 + Cu
(e) PbO2 + SO2 ⟶ PbSO4
(f) 2KClO3 ⟶ 2KCl + 3O2 ↑
(g) 2H2O2 ⟶ 2H2O + O2 ↑
(h) KNO3 + H2SO4 ⟶ HNO3 + KHSO4
(i) CuO + H2 ⟶ Cu + H2O
(j) CaCO3 ⟶ CaO + CO2 ↑
(k) NH4Cl ⟶ NH3 + HCl
(l) PbO + 2HNO3 ⟶ Pb(NO3)2 + 2H2O
(m) AgNO3 + NaCl ⟶ AgCl ↓ + NaNO3
Answer
(a) Cl2 + 2KBr ⟶ 2KCl + Br2
Displacement reaction
(b) NaOH + HCl ⟶ NaCl + H2O
Neutralisation reaction
(c) 2HgO ⟶ 2Hg + O2 ↑
Decomposition reaction
(d) Fe + CuSO4 ⟶ FeSO4 + Cu
Displacement reaction
(e) PbO2 + SO2 ⟶ PbSO4
Combination reaction
(f) 2KClO3 ⟶ 2KCl + 3O2 ↑
Decomposition reaction
(g) 2H2O2 ⟶ 2H2O + O2 ↑
Decomposition reaction
(h) KNO3 + H2SO4 ⟶ HNO3 + KHSO4
Double decomposition reaction
(i) CuO + H2 ⟶ Cu + H2O
Displacement reaction
(j) CaCO3 ⟶ CaO + CO2 ↑
Decomposition reaction
(k) NH4Cl ⟶ NH3 ↑ + HCl
Decomposition reaction
(l) PbO + 2HNO3 ⟶ Pb(NO3)2 + H2O
Neutralisation reaction
(m) AgNO3 + NaCl ⟶ AgCl ↓ + NaNO3
Double decomposition reaction
Related Questions
(a) What are double displacement reactions?
(b) Give an example of a double displacement reaction, where gas is evolved.
(a) What is a decomposition reaction ?
(b) Decomposition reactions can occur by (i) heat (ii) electricity and (iii) sunlight.
Give two balanced reactions for each.Which of the of following is not a chemical change.
- Rusting of iron
- Iron is magnetised
- Potassium is dissolved in water
- Magnesium wire is burnt
Heating of zinc nitrate is a …………… reaction.
- Displacement
- Combination
- Decomposition
- Redox