Q. 7

(a) Give an examp

Answer :

(a) When calcium oxide and water combine to form a single product calcium hydroxide, a large amount of heat is also released. Therefore it is a combination reaction which is exothermic.

(b)


(c) The phenomenon is rancidity. When fats and oils are oxidised, they become rancid and their smell and taste changes. This phenomenon is called rancidity.


Prevention from rancidity. Antioxidants are added to food containing fats and oils to prevent them from oxidation.


For example: An inert gas such as nitrogen is added to prevent the packed chips from getting oxidised.


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