Question

Identify the substances that are oxidised and the substances that are reduced in the following reactions:

i. 4Na_(s) + O_2(g) → 2Na₂O_(s)
ii. CuO(s) + H₂(g) → Cu_(s) + H₂O_(I)

Answer 1

i. In the given reaction, sodium gets oxidised to sodium oxide (Na2O) and oxygen gets reduced.
ii. In the given reaction, hydrogen getsoxidised to water and copper (II) oxide gets reduced to copper metal.