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CHEMISTRY

Chemistry
The percentage of carbon in cost iron is :

6 to 8
0.5 to 1.5
3 to 5
0.01 to 0.25

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Chemistry
Brass is a solution of molten copper in

Molten tin
Gaseous zinc
Solid zinc
Molten zinc

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Chemistry
The water pollution in river is measured by the dissolved amount of

Chlorine
Oxygen
Nitrogen
Ozone

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Chemistry
Ultraviolet rays can be used in water treatment as

Disinfectant
Flocculator
Hydrolyser
Precipitator

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Chemistry
Tar roads get damaged if there is

No sloping
Heavy traffic
No maintenance
Stagnation of water on road

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