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Chemistry

Chemistry
Colloids can be purified by

Condensation
Dialysis
Condensation
Condensation

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Chemistry
White phosphorus is generally kept under

Glycerine
Kerosene oil
Water
Alcohol

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Chemistry
Which one of the following elements is used in the manufacture of safety matches?

Silicon
Sodium
Phosphorus
Graphite

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Chemistry
Which of the following is used to increase the anti-knocking property of petrol ?

Triethyl lead
Tetramethyl lead
Tetraethyl lead
Trimethyl lead

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Chemistry
The mass number of an atom is equal to

the number of protons and electrons
the number of nucleons
the number of protons
the number of neutrons

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Chemistry
Williamson's synthesis is widely used in the laboratory preparation of

Alcohols
Esters
Ethers
Aldehydes

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