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Chemistry

Chemistry
Which one of the following is known as the 'brown coal'?

Bituminous
Coke
Lignite
Anthracite

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Chemistry
The octane number of zero is assigned to

3-methyl octane
n-heptane
2-methyl octane
iso-octane

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Chemistry
The most abundant constituent of atmospheric air is :

Nitrogen
Hydrogen
Carbon
Oxygen

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Chemistry
Of the following, which one pollutes the air of a big city ?

Lead
Cadmium
Chromium
Copper

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Chemistry
Colloids can be purified by

Condensation
Condensation
Dialysis
Condensation

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Chemistry
Suspension particles have the size between

10–5 – 10–7cm
10–8 – 10–10cm
10–1 – 10–2 cm
10–2 – 10–4 cm

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