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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.
Medicines
How is chemistry helpful in improving the health of human beings?
What is the contribution of chemistry in following field?
Clothing
Name the scientists who discovered the following:
Safety lamp
Choose the correct alternative from the choices given below for the following statement:
The chemicals prescribed by a doctor in the treatment of infectious diseases are called
State the contributions of Dimitri Mendeleev
Explain the term ‘cosmetics’ ‘talc’. Name a few main ingredients in cosmetics the role they play.
Differentiate between natural fibres & synthetic fibres.
Give reasons for the following
Aspirin is one of the most widely used medications – globally.
Give reasons for the following
Polyester is added to natural fiber cotton, to give terylene.
