Name two anti-oxidants which are usually added to fat and oil containing foods to prevent rancidity.

10 Give one example of a decomposition reaction which is carried out:

(a) with electricity

(b) by applying heat

11 What type of chemical reaction is used to extract metals from their naturally occurring compounds like oxides or chlorides? 13 Write one equation each for the decomposition reactions where energy is supplied in the form of (a) heat, (b) light, and(c) electricity. 14 In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the chemical equation of the reaction involved.