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CHEMISTRY

Chemistry
Diamond is harder than graphite because of :

Tetrahedral structure of diamond
None of these
Difference of crystalline structures
Difference in layers of atoms

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Chemistry
The gas used to extinguish fire is

Nitrogen
Neon
Carbon monoxide
Carbon dioxide

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Chemistry
Which among the following coal contains 90 per cent of carbon?

Anthracite
Lignite
Bitumen
Peat

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Chemistry
One carat of diamond is equal to

100 mg
200 mg
150 mg
250 mg

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Chemistry
Hardest allotrope of carbon is

Diamond
Coke
Lamp black
Graphite

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