class 10 science question answer 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)
solution :
(i) 4Na(s) + O2(g) → 2Na2O(s)
In this reaction sodium (Na) is oxidised and oxygen (O2) is reduced.
(ii) CuO(s) + H2(g) → Cu(s) + H2O(l)
In this reaction CuO is reduced and H2 is oxidised.
Na is oxidised and O2 is reduced.
H2 is oxidised and CuO is reduced.
