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Chemistry

Chemistry
Threshold limit value of copper in the atmospheric air is

0.01 mg/m3
1.0 mg/m3
0.001 mg/m3
5.0 mg/m3

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Chemistry
Which of the following is the main nitrogenous waste in humans ?

Urea
Uric Acid
Ammonia
Ammonium Nitrate

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Chemistry
The metal ion present in Vitamin B12 is

Cobalt
Zinc
Iron
Nickel

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Chemistry
Zone refining is used for the purification of

Ge
Cu
Au
Ag

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Chemistry
The substance that is added to make natural rubber strong and more bouncy is

Sulphur
Sponge
Polythene
Chlorine

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Chemistry
Which one of the following group of gases contributes to the 'Green House Effect'?

Carbon dioxide and Methane
Carbon monoxide and Sulphur dioxide
Carbon tetraflouride and Nitrous oxide
Ammonia and Ozone

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