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Chemistry

Chemistry
Mercury is emitted into air by

Burning garbage
Coal fire
Burning coal
Steam engine

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Chemistry
Which of the following is used for refrigeration?

Sulphur dioxide
Freon
Phosphine
Chlorine

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Chemistry
Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives

Copper at cathode and anodes dissolve to give copper
Copper at cathode and oxygen at anode
Hydrogen at cathode and oxygen at anode
Copper at anode and oxygen at cathode.

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Chemistry
The antiseptic compound present in dettol is

Enloroxylenol
Iodine
Cresol
Biothional

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Chemistry
Gunpowder consits of a mixture of

TNT and charcoal
Sand and TNT
Sulphur, sand and charcoal
Nitre, sulphur and charcoal

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Chemistry
Total number of naturally occurring elements

110
92
62
98

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MORE MCQ ON Chemistry

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