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Chemistry

Chemistry
What is the element that is in the highest percentage in the composition of the earth ?

Oxygen
Magnesium
Iron
Silicon

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Chemistry
The National Chemical Laboratory (India) is located in

Pune
Hyderabad
Bangaluru
Mumbai

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Chemistry
The greenhouse effect is caused by the higher level of which gas in the atmosphere ?

Carbon monoxide
Carbon dioxide
Nitrous oxide
Sulphur dioxide

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Chemistry
The percentage of oxygen in air is approximately

1
0.01
0.78
0.21

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Chemistry
The common refrigerant in domestic refrigerator is

Nitrogen
Neon
Freon
Oxygen

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Chemistry
Carborundum is another name of

Silicon carbide
Calcium oxide
Silicon oxide
Calcium carbide

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MORE MCQ ON Chemistry

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