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Chemistry

Chemistry
Aluminium can be purified by

Oxidation
Distillation
Electrolysis
Ozonolysis

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Chemistry
What is the mass percentage of oxygen in carbon dioxide (CO2)

0.658
0.305
0.509
0.727

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Chemistry
The ionic radii of N3-, O2-, F- and Na+ follows the order

N3- > Na+ > O2- > F-
O2- > F- > Na+ > N3-
N3- > O2- > F- > Na+
Na+ > O2- > N3- > F-

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Chemistry
Curd is sour due to presenceof

Acetic acid
Tartaric acid
Lactic acid
Oxalic acid

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Chemistry
What is the maximum Water Vapour content in the atmosphere?

5 to 6 per cent
2 to 3 per cent
3 to 4 per cent
4 to 5 per cent

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Chemistry
The chemical bahaviour of an atom depends upon

The number of electrons orbiting around the nucleus
The number of protons in its nucleus
The number of nucleons in the nucleus
The number of neutrons in the nucleus

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