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Chemistry

Chemistry
Percentage of lead in lead pencils is

80
40
31-66

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Chemistry
Which type of radiations are absorbed by the upper layer of the atmosphere?

Infrared
Ultraviolet
Visible
Radio-waves

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Chemistry
Aspirin is chemically known as

Acetylsalicylic acid
Hydroxysalicylate
Methyl salicylate
Alkylsalicylic acid

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Chemistry
Inert gases are

Miscible with water
Chemically very active
Chemically unreactive
Not stable

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Chemistry
The lightest gas which is non-inflammable is

Oxygen
Nitrogen
Hydrogen
Helium

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Chemistry
Which gas does not form the part of atmosphere ?

None of these
Chlorine
Nitrogen
Helium

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MORE MCQ ON Chemistry

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