Question

Identify the substances that are oxidized and the substances that are reduced in the following reactions:
i) 4 Na+O2 → 2Na2O
ii) CuO +H2→Cu +H2O​

Answer 1

Answer:

The oxidized substance is called a reduction agent. The reduced substance is called an oxidizing agent.

(i) 4Na(s) + O2(g) → 2Na2O(s)

Oxidized substance – Na

Reduced substance – O2

In the first equation sodium (Na) is getting oxidized with the addition of Oxygen (O2).

(ii) CuO(s) + H2(g) → Cu(s) + H2O(l)

Oxidized substance – H2

Reduced substance – CuO

In the second equation copper (Cu) is reduced due to the addition of Hydrogen (H2).

Explanation:

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