Question

Identify the substance that are oxidized and the substances that are reduced in the following reactions.
i) 4Na (S) + O2 (g) ->2Na O(S)
ii) CuO (S) + H2 (g) ->Cu (S) + H2O (I)

Answer 1

HEY HERE IS THE ANSWER FOR YOU QUESTION

1.    => substance oxidized - 4 Na

     =>substance reduced - O 2  

2.   => substance oxidized - H 2  

      =>substance reduced - Cu O

Answer 2

Answer:

(i) 4Na (S) + O2 (g) ->2Na O(S)

Sodium (Na) is oxidised as it gain oxygen and oxygen gets reduced.

(ii) CuO (S) + H2 (g) ->Cu (S) + H2O (I)

Copper oxide (CuO) is reduced to Copper (Cu) while hydrogen (H2) gets oxidised to water (H2O).