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Chemistry

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

Iron
Oxygen
Silicon
Magnesium

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Chemistry
When formaldehyde and potassium hydroxide are heated, we get

Ethyl formate
Methyl alcohol
Acetylene
Methane

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Chemistry
The chemical name of 'Plaster of Paris' commonly used for setting broken bones is

Calcium sulphate
Calcium nitrate
Calcium chloride
Calcium carbonate

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

Carbon dioxide
Nitrous oxide
Sulphur dioxide
Carbon monoxide

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Chemistry
Aerated water contains

H2
SO2
CO2
NO2

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Chemistry
For generation of biogas, the materials commonly used are

Forest residues
Aquatic plants
Crop residues
Animal wastes

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MORE MCQ ON Chemistry

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