Question

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)

Answer 1

(1) sodium is the substance that is oxidized
(2) copper is the substance that is reduced and hydrogen is the substance that is oxidized

Answer 2

$\bigstar$ Solution:

1. The Sodium in the first equation is getting oxidized with the addition of Oxygen.
2. Copper in the second equation is reduced due to the addition of Hydrogen.