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Chemistry

Chemistry
The electronic configuration of an atom having atomic number ‘20’ is

2, 8, 8, 2
2, 8, 10
2, 10, 8
2, 6, 8, 4

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Chemistry
Which of the following is not a gaseous air pollutant?

Oxides of sulphur
Smoke
Hydrocarbon
Oxides of nitrogen

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Chemistry
Mercury is emitted into air by

Steam engine
Coal fire
Burning garbage
Burning coal

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Chemistry
The number of moles of solute present in 1 kg of a solvent is called its

normality
molarity
molality
formality

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Chemistry
Vulcanized rubber contains sulphur

3-5%
10-15%
7-9%
0.02

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Chemistry
Impure camphor is purified by

Fractional distillation
Fractional crystallisation
Steam distillation
Sublimation

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