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प्रश्न
Give reasons for the following
Ordinary soap is wasted in hard water.
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उत्तर
Ordinary soap is wasted in hard water because hard water is one which does not lather with soap.
संबंधित प्रश्न
Give two examples of the following substance.
Food preservatives
Give two examples of the following substance.
Fuel
Give two examples of the following substance.
Building materials
What is the contribution of chemistry in following field?
Industry
Name the scientists who discovered the following:
Safety lamp
_____________ help to increase the production of food.
State the contributions of Antoine Lavoisier
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.
