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Chemistry

Chemistry
The noble gas used in radiotherapy is

Xenon
Argon
Radon
Neon

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

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

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Chemistry
Most poisonous pollutant in water is

Zinc
Detergent
Phosphate
Arsenic

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Chemistry
The oil used in the froth floatation process is

coconut oil
olive oil
pine oil
kerosene oil

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Chemistry
When ice cubes are made, the entropy of water

Increases
May either increase or decrease depending on the process used
Decreases
Does not change

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Chemistry
In upper layer of atmosphere ozone is formed by

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

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