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Chemistry

Chemistry
Among the following, which is always found in free-state in nature?

Sodium
Gold
Silver
Copper

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Chemistry
The ore of Aluminium is

Fluorspar
Bauxite
Hematite
Chalco pyrites

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Chemistry
Particulates (< 1 µm size) remaining suspended in air indefinitely and transported by wind currents are called

Fumes
Mists
Smoke
Aerosols

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Chemistry
Which one of the following chemicals helps in fruit ripening?

Ethephon
Atrazine
Isoproturan
Malathion

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Chemistry
Which of the following produces highest amount of energy upon oxidation?

Fat
An alkane
Protein
Glucose

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Chemistry
Sulphur dioxide bleaches colouring matter by :

Dehydration
Decomposition
Oxidation
Reduction

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