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Chemistry

Chemistry
Which among the following is used to dilute oxygen in the gas cylinders used by divers ?

Neon
Argon
Krypton
Helium

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Chemistry
Which of the following elements is found in all organic compounds

Oxygen
Calcium
Nitrogen
Carbon

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Chemistry
The pH of lemon juice is expected to be

Nothing can be predicted
Less than 7
More than 7
Equal to 7

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Chemistry
The method of concentrating the ore which makes use of the difference in density between ore and impurities is called

liquation
magnetic separation
levigation
leaching

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Chemistry
Molasses a by-product in the manufacture of sugar, is converted into

Paper
Alcohol
Pulp
Fuel

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Chemistry
The function of sedimentation tank in sewage treatment is to:

Disinfect the sewage
Remove water content
Remove suspended solids
Aerate the sewage

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