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Chemistry

Chemistry
The fiber least prone to catch fire is

Nylon
Polyester
Cotton
Terylene

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Chemistry
0.01 mole of NaOH is added to 10 liters of water. The pH of water changes by

3
6
7
4

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Chemistry
The highest volume of gases in lower atmosphere is comprised of

Oxygen
Nitrogen
Hydrogen
Carbon dioxide

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Chemistry
Natural rubber is the polymer of :

Ethylene
Styrene
Isoprene
Butadiene

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Chemistry
Percentage of lead in lead pencils is

40
80
31-66

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Chemistry
Hardest allotrope of carbon is

Coke
Diamond
Lamp black
Graphite

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