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Chemistry

Chemistry
Williamson's synthesis is widely used in the laboratory preparation of

Aldehydes
Ethers
Alcohols
Esters

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Chemistry
Which gas does not form the part of atmosphere ?

Chlorine
Helium
Nitrogen
None of these

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Chemistry
The chemical name of rat poison is

Zinc oxide
Lead nitrate
Zinc phosphide
Potassium cyanide

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Chemistry
Muddy water is treated with alum in purification process, itis termed as :

Emulsification
Coagulation
Absorption
Adsorption

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Chemistry
Aquaregia is a mixture of the following in the ratio 1 : 3 by volume

Conc. HNO3 and conc. HCl
Conc. HNO3 and conc. H2SO4
Dil. HCl and dil. HNO3
Conc. HCl and conc. HNO3

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Chemistry
Hydrogen is not found in atmosphere because

It immediately combines with oxygen to form water
It is absorbed by plants
It is highly inflammable
It is the lightest gas

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