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Chemistry

Chemistry
Dry ice is the solid form of :

Water
Nitrogen
Carbon di–oxide
Air

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Chemistry
The presence of ozone in the stratosphere is responsible for

Checking the penetration of ultra-violet rays to the earth
Higher rate of photosynthesis
Increasing the average global temperature in recent years
Supplying oxygen for people travelling in jets

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Chemistry
Asbestos is formed of :

Calcium and Zinc
Calcium and Magnesium
Copper, Zinc and Manganese
Lead and Iron

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Chemistry
Iron is extracted from

Bauxite
Cinnabar
Dolomite
Haematite

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Chemistry
In chemical terms, what are alums used for purifying water for drinking purposes ?

Double nitrate
Double sulphates
Nitrates of aluminium
Hydrated chlorides

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Chemistry
Tear gas is :

Carbonyl chloride
Nitrous oxide
Chloroprene
Bleaching powder

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MORE MCQ ON Chemistry

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