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Chemistry

Chemistry
When Hydrogen starts burning in air, it produces ?

Water
Methane
Carbonic Acid
Ammonia

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Chemistry
Non-stick kitchenwares are coated with

Graphite
Silicon
Teflon
PVC

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Chemistry
The process of removing calcium and magnesium from hard water is known as

Filtration
Water softening
Flocculation
Sedimentation

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Chemistry
Among the following the hardest metal is

Tungsten
Iron
Gold
Platinum

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Chemistry
The absolute temperature of a gas is doubled and the pressure is reduced to half, the volume of the gas

Will be doubled
Remains unchanged
Will be reduced to half
Will increase four-fold

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Chemistry
The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?

1/6
1/4
1/8
1/3

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