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Chemistry

Chemistry
Commercial Vaseline is derived from

Wool wax
Coal tar
Petroleum
Plant gums

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Chemistry
Ozone layer is present in

Troposphere
Exosphere
Ionosphere
Stratosphere

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Chemistry
Air is said to be saturated when :

Its pressure is minimum
It contains maximum content of water vapour
It blows over the barren land
Its thickness is maximum

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Chemistry
Colour imparted to the Bunsen flame by strontium salt is

Crimson red
Apple-green
Bluish green
Brick red

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Chemistry
Which type of fire extinguisher is used for petroleum fire ?

Powder type
Foam type
Soda acid type
None of these

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Chemistry
Which of the following is used as a preservative to protect processed food?

Sodium sulphate
Saccharin
Sodium metabisulphite
BHT

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