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प्रश्न
Name the scientists who discovered the following:
Oxygen
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उत्तर
A scientist who discovered Oxygen: Joseph Priestly
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संबंधित प्रश्न
Give two examples of the following substance.
Food preservatives
Give two examples of the following substance.
Building materials
Give two examples of the following substance.
Chemical war weapons
What is the contribution of chemistry in following field?
Clothing
What is the contribution of chemistry in following field?
Medicines
Name the scientists who discovered the following:
Safety lamp
Write True or False against the following statement.
Antibiotics are used as preservatives:
Choose the correct alternative from the choices given below for the following statement:
Mortar is used as a
Differentiate between natural fibres & synthetic fibres.
Give reasons for the following
All medicines must be taken under proper doctors' supervision and in the correct dose.
