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Chemistry

Chemistry
The percentage of oxygen in air is approximately

0.01
0.21
0.78
1

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Chemistry
The process of improving the quality of rubber by heating it with sulphur is called.

Galvanization
Sulphonation
Acceleration
Vulcanization

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Chemistry
Iodine value is used to estimate

Carboxylic groups in oil
Unsaturation in oil
Hydroxyl groups in oil
Alkali content in oil

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Chemistry
By which organic compound all the oils are known ?

Hydrocarbon
Ester
Protein
Carbohydrate

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Chemistry
Terylene is a condensation polymer of ethylene glycol and which acid?

Phthalic acid
Terephthalic acid
Benzoic Acid
Salicylic acid

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Chemistry
Mercury is emitted into air by

Steam engine
Coal fire
Burning coal
Burning garbage

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