1. Name any two food preservatives and state why they are used.
2. Why do we use cosmetics?
3. Name two natural fibres and two synthetic fibres.
4. Name any two medicines and state why they are used.
5. What is the importance of chemical industry?
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A windowpane is 5 inches tall and the diagonal distance from one corner to the other is 13 inches. How wide is the windowpane?
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