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Identify the substances that are oxidised and the substances that are reduced in the following reactions. i. 4Na(s) + O2 (g) → 2Na2O(s) ii. CuO(s) + H2(g) → Cu(s) + H2O(l)

Identify the substances that are oxidised and the substances that are reduced in the following reactions.
i. 4Na(s) + O2 (g) → 2Na2O(s)
ii. CuO(s) + H2(g) → Cu(s) + H2O(l)

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 6228 Points
2 months ago
i. 4Na(s) + O2 (g) → 2Na2O(s) Here oxygen is added to sodium. The addition of oxygen is Called oxidation. So the substance that is oxidized is sodium Na. ii. CuO(s) + H2(g) → Cu(s) + H2O(l) In this reaction, copper oxide (CuO) gives the oxygen required for the oxidation of hydrogen; therefore, copper oxide is the oxidizing agent. Hydrogen is responsible for removing oxygen from copper oxide; therefore, hydrogen is the reducing agent here.

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