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प्रश्न
Give reasons for the following
Cosmetics may contain preservatives, as one of their ingredients.
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उत्तर
They extend the shelf life of a cosmetic and may prevent growth of microorganisms.
संबंधित प्रश्न
Give two examples of the following substance.
Fuel
What is the contribution of chemistry in following field?
Clothing
Name the scientists who discovered the following:
Oxygen
Fill in the blank:
Inert gases were discovered by ___________
Write True or False against the following statement.
D.D.T. is an important fertiliser:
Explain in brief the importance of Chemistry in the production of various products.
State the contributions of Dimitri Mendeleev
State the contributions of John Dalton – towards the development of Chemistry.
Give reasons for the following
All medicines must be taken under proper doctors' supervision and in the correct dose.
Select the correct name from the choices given below for the following case.
A synthetic fibre used in clothing.
