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Chemistry

Chemistry
The number of waves in n x 10th Bohr's orbit are

n-2
n3
n2
n

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Chemistry
Commercial nitric acid is coloured because it contains dissolved :

Oxygen
Nitrogen dioxide
Nitrous oxide
Coloured impurities

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Chemistry
0.01 mole of NaOH is added to 10 liters of water. The pH of water changes by

3
7
4
6

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Chemistry
Aerated water contains

CO2
H2
SO2
NO2

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Chemistry
Hardness of the water is commonly measured in terms of

Magnesium carbonate equivalents
Calcium carbonate equivalents
Magnesium sulphate equivalents
Calcium sulphate equivalents

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Chemistry
Which one of the following is not coal variety?

Bituminous
Dolomite
Peat
Lignite

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