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Chemistry

Chemistry
The smog is essentially caused by the presence of

O2 and O3
Oxides of N and S
O2 and N2
O3 and N2

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Chemistry
Nylon is a type of

Polyamide
Acrylic
Polyolefin
Polyester

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Chemistry
The fiber least prone to catch fire is

Nylon
Terylene
Polyester
Cotton

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Chemistry
In upper layer of atmosphere ozone is formed by

Subjecting oxygen to high pressure
The combination of oxygen molecules
The action of ultraviolet rays on oxygen
The action of nitrogen on oxygen in atmosphere

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Chemistry
Which one of the following is used to restore the colour of old oilpaintings ?

Ozone
Barium peroxide
Sodium peroxide
Hydrogen peroxide

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Chemistry
The element with highest first ionisation energy is

Hydrogen
Sodium
Helium
Lithium

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