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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
How is chemistry helpful in improving the health of human beings?
What is the contribution of chemistry in following field?
Industry
What is the contribution of chemistry in following field?
Cosmetics
Name the scientists who discovered the following:
Safety lamp
Fill in the blank:
L.P.G. is used for ___________
Write True or False against the following statement.
Antibiotics are used as preservatives:
Write True or False against the following statement.
D.D.T. is an important fertiliser:
State the contributions of Dimitri Mendeleev
Explain how medicines are a boon to mankind. State the positive & negative effects of medicines like aspirin and paracetamol.
Food processing is an important procedure for obtaining marketable food products.
