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CHEMISTRY

Chemistry
Diamond is lustrous because

It is pure
It is hard
It is colourless
Its refractive index is high

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Chemistry
Which of the following gases is present under pressure in soft drinks?

Nitrogen
Oxygen
Carbon dioxide
Nitrous oxide

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Chemistry
If we burn graphite,

It will change into diamond
No residue will be left
Residue will be left
It will not burn

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Chemistry
Lead pencil contains

Graphite
Lead sulphide
Ferrous sulphide
Lead

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Chemistry
Highest percentage of carbon is found in which form of coal?

Lignite
Anthracite
Bituminous
Peat

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