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प्रश्न
Name the scientists who discovered the following:
Oxygen
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उत्तर
A scientist who discovered Oxygen: Joseph Priestly
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संबंधित प्रश्न
Give two examples of the following substance.
Chemical war weapons
How is chemistry helpful in improving the health of human beings?
Name the scientists who discovered the following:
Atoms
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Write True or False against the following statement.
D.D.T. is an important fertiliser:
Differentiate between the terms food preservatives and food processing with appropriate examples.
Explain the term ‘cosmetics’ ‘talc’. Name a few main ingredients in cosmetics the role they play.
Differentiate between natural fibres & synthetic fibres.
Explain how medicines are a boon to mankind. State the positive & negative effects of medicines like aspirin and paracetamol.
Give reasons for the following
All medicines must be taken under proper doctors' supervision and in the correct dose.
