Bright Tutorials Bright Tutorials
ICSE Class 8 Chemistry Question 14 of 18

Hydrogen — Question 1

Back to all questions
1
Question

Question 1

Give balanced equations for the following conversions:

  1. Zinc to sodium zincate - using an alkali.

  2. Acidified water to hydrogen - by electrolysis.

  3. Water gas to hydrogen - industrially.

  4. Iron [III] oxide to iron - using hydrogen.

  5. Nitrogen to a basic gas - using hydrogen.

Answer

  1. Zn + 2NaOH ⟶ Na2ZnO2 + H2 ↑

  2. 2H2O ⇌ 2H2 + O2

  3. [CO+H2]water gas+H2Oexcess steam→Fe2O3450°CCO2+2H2+Δ\underset{\text{water gas}}{[\text{CO} + \text{H}_2 ]} + \underset{\text{excess steam}}{\text{H}_2\text{O}} \xrightarrow[\text{Fe}_2\text{O}_3]{450 \degree \text{C}} \text{CO}_2 + 2\text{H}_2 + \Delta

  4. Fe2O3 + 3H2 ⟶ 2Fe + 3H2O

  5. N2 + 3H2 ⇌ 2NH3