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Chemistry

Chemistry
Which one of the following is not present in cement ?

Alumina
Gypsum
Clay
Alum

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Chemistry
The main source of Naphthalene is

Camphor
Diesel
Coal-tar
Charcoal

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Chemistry
Commercial nitric acid is coloured because it contains dissolved :

Coloured impurities
Nitrous oxide
Nitrogen dioxide
Oxygen

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Chemistry
Which among the following is used as a catalyst in the production of high octane fuels?

HNO3
H2SO4
HF
HCl

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Chemistry
The lowest layer of earth's atmosphere is

Troposphere
Stratosphere
Mesosphere
Ionosphere

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Chemistry
Carbon monoxide is an inflammable gas. Which one of the following is also inflammable?

Oxygen
Helium
Nitrogen
Hydrogen

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