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Chemistry

Chemistry
Water can be separated from alcohol water mixture by

Distillation
Sublimation
Evaporation
Decantation

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Chemistry
Which of the following is secondary air pollutant ?

SO2
Photochemical smog
NO2
Dust particles

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Chemistry
Chemical name of Gammaxane is

Toluene
Benzene hexachloride
Aniline
Chloro benzene

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Chemistry
A balloon filled with helium rises in air because

Air exerts an upward force on the balloon
The balloon is weightless
Helium pushes down on the air below the balloon
Helium is less dense than air

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Chemistry
Among the following, carbonate ore of Zinc is

Zincblende
Sphalerite
Zincite
Calamine

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Chemistry
What is the maximum Water Vapour content in the atmosphere?

3 to 4 per cent
2 to 3 per cent
4 to 5 per cent
5 to 6 per cent

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