What is the general name of the chemicals which are added to fat and oil containing foods to prevent the development of rancidity?

4 Write the balanced chemical equation for the following reaction :

Zinc + Silver nitrate Zinc nitrate + Silver

5 Which term is used to indicate the development of unpleasant smell and taste in fat and oil containing foods due to aerial oxidation (when they are kept exposed for a considerable time)? 7 State an important use of decomposition reactions. 8 What are anti-oxidants? Why are they added to fat and oil containing foods?