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Chemistry

Chemistry
Periodic table contains how many periods

7
8
10
6

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Chemistry
The monomer of polythene is

vinyl chloride
ethyl alcohol
ethylene
None of these

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Chemistry
Impure camphor is purified by

Steam distillation
Sublimation
Fractional distillation
Fractional crystallisation

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Chemistry
What is the mass percentage of oxygen in carbon dioxide (CO2)

0.658
0.727
0.305
0.509

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Chemistry
Vulcanization of rubber is carried out by adding

Sulphur
Ozone
Phosphorus
Carbon

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Chemistry
Which of the following is used in dating archaeological findings ?

13H
92235U
818O
614C

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