a) Why plastic containers are favoured for storing food? (2)
(b) What is the nature of oxide of sodium? What happens when it is dissolved in water? Write
chemical reaction involved. (2)
(c) Why is petroleum called black gold?
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Answer:
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Explanation:
1. Plastic containers are favoured for storing food because they are light in weight , cheap in price ,easy handling and food which are stored in plastic containers not spoilt.
2 . So2 is acidic in nature.
When dissolved in water it produces sulphorous acid
reaction:-:So2+ H2O ==H2So3
3. Petroleum is referred to as 'black gold' because when crude oil is extracted from the land it is black in colour. People call it gold because of its oils and value. It is very difficult to find.
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