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Chemistry

Chemistry
The main active constituent of tea and coffee is

nicotine
chlorophyll
aspirin
caffeine

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Chemistry
Forth floatation process to concentrate the minerals is applicable to

Bauxite
Chalcopyrites
Calamine
Haematite

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Chemistry
The fiber least prone to catch fire is

Terylene
Cotton
Nylon
Polyester

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Chemistry
Glycol is used to manufacture which of the following ?

Rubber
Nylon
Terylene
Artificial silk

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Chemistry
Vulcanized rubber contains sulphur

3-5%
7-9%
10-15%
0.02

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Chemistry
Cement is formed by strongly heating a mixture of

Chalk and graphite
Limestone and graphite
Clay and graphite
Limestone and clay

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