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Chemistry

Chemistry
The lowest layer of earth's atmosphere is

Mesosphere
Ionosphere
Troposphere
Stratosphere

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Chemistry
A thick paste of cement, sand and water is called

Mortar
R.C.C.
Concrete
Kiln

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

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

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Chemistry
Galvanization is the :

Deposition of tin on iron
Deposition of zinc on iron
Deposition of aluminium on iron
Deposition of copper on iron

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Chemistry
Which one of the following does not contain Silver ?

German Silver
Horn Silver
Lunar Caustic
Ruby Silver

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Chemistry
Formation of ozone hole is maximum over

Europe
Africa
India
Antarctica

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