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Chemistry

Chemistry
The percentage of oxygen in air is approximately

0.01
1
0.21
0.78

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Chemistry
Main pollutants released from iron and steel industry are

CO, CO2 and SO2
NO, SO3 and H2S
CO2, NO2 and SO3
CO2, H2S and NO2

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Chemistry
Chile saltpeter is the common name of:

Potassium nitrite
Sodium nitrate
Potassium nitrate
Sodium nitrite

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Chemistry
The gas used for filling weather balloons is

Air
Hydrogen
Helium
Nitrogen

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Chemistry
Sea water is saltier than rain water because

Sea animals are salt producing
The air around the sea is saltish
Sea beds have salt producing mines
Rivers wash away salts from earth and pour them into the sea

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Chemistry
Which of the following is an antidiabatic drug?

Insulin
Aspirin
Penicillin
Chloroquine

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