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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.
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Fungicides
Give two examples of the following substance.
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Name the chemicals which help in increasing food production.
What is the contribution of chemistry in following field?
Medicines
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Fill in the blank:
L.P.G. is used for ___________
Write True or False against the following statement.
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D.D.T. is an important fertiliser:
