question_answer

  In the reaction represented by the following equation: CuO(s) + H2(g) ® Cu(s)+H2O(l)                 (a)Name the substance oxidized. (b) Name the substance reduced.

Answer:

                      In the presence of oxygen in the air, the fats present in the fatty food are oxidized to compounds which have a bad smell, i.e., the food becomes rancid. Flushing with nitrogen cuts off the contact of food with oxygen and protects the food from rancidity.