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Question
Paheli went to the market to buy sarees for her mother. She took out a thread from the edge of the two sarees shown by the shopkeeper and burnt them. One thread burnt with a smell of burning hair and the other burnt with the smell of burning paper. Which thread is from a pure cotton saree and which one from a pure silk saree? Give reason for your answer.
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Solution
The thread that burns with the smell of burning hair is from a pure silk saree and the thread that burns with the smell of burning paper is from a pure cotton saree. It is because both silk and hair are protein fibres whereas both cotton and paper are carbohydrates.
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