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ICSE Class 9 Chemistry Question 26 of 26

Study of the First Element — Hydrogen — Question 2

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Question

Question 2

Give balanced equations for the following conversions, 1 to 5.

  1. MgCl2 ⟵ HCl ⟶ FeCl2
  2. KAlO2 ⟵ KOH ⟶ K2ZnO2
  3. ZnO ⟵ H2O ⟶ Fe3O4
  4. CO + H2 ⟵ H2O ⟶ CO2 + H2
  5. NH3 ⟵ H2 ⟶ H2S
Answer

  1. MgCl2 ⟵ HCl ⟶ FeCl2
    Mg + 2HCl ⟶ MgCl2 + H2
    Fe + 2HCl ⟶ FeCl2 + H2

  2. KAlO2 ⟵ KOH ⟶ K2ZnO2
    2Al + 2KOH + 2H2O⟶ 2KAlO2 + 3H2 [g]
    Zn + 2KOH ⟶ K2ZnO2 + H2[g]

  3. ZnO ⟵ H2O ⟶ Fe3O4
    Zn + H2O ⟶ ZnO + H2 [g]
    3Fe + 4H2O ⇌ Fe3O4 + 4H2 [g]

  4. CO + H2 ⟵ H2O ⟶ CO2 + H2
    Ccoke+H2Osteam→1000°C[CO+H2]water gas−Δ\underset{\text{coke}}{\text{C}} + \underset{\text{steam}}{\text{H}_2\text{O}} \xrightarrow{1000 \degree \text{C}} \underset{\text{water gas}}{[\text{CO} + \text{H}_2 ]} - \Delta
    [CO+H2]water gas+H2Oexcess steam→450°CFe2O3CO2+2H2+Δ\underset{\text{water gas}}{[\text{CO} + \text{H}_2 ]} + \underset{\text{excess steam}}{\text{H}_2\text{O}} \underset{\text{Fe}_2\text{O}_3} {\xrightarrow{450 \degree \text{C}}} \text{CO}_2 + 2\text{H}_2 + \Delta

  5. NH3 ⟵ H2 ⟶ H2S
    N2 + 3H2 ⇌ 2NH3
    H2 + S ⟶ H2S