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Differentiate between natural fibres and synthetic /artificial/man made fibres.
What do you mean by burning test? Write burning test of cotton and nylon.
How does pesticides and weedicides create pollution? What are the main things which get polluted by these chemicals?
How does the name Nylon come ? What are the chemical which are used to make nylon?
What is the difference between permanent hardness of water and temporary hardness of water?
What do you mean by hard water ? Why can't we use hard water in our daily life?