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Chemistry

Chemistry
Silicon is a

Insulator
Nonconductor
Conductor
Semiconductor

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Chemistry
Which of the following can be found as pollutants in the drinking water in some parts of India? Select the correct answer using the code given below.(A) Arsenic (B) Sorbitol (C) Fluoride (D) Formaldehyde (E) Uranium

A, B, C, D and E
A, C and E
B, D and E
A and C

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Chemistry
The total energy of revolving electron in an atom

Can have any value above zero
Cannot be negative
Will always be positive
Can never be positive

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

Sulphonation
Galvanization
Vulcanization
Acceleration

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Chemistry
Gobar gas mainly contains

Carbon monoxide
Carbon dioxide
Methane
Hydrogen sulphide

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Chemistry
Pollutant from motor car exhaust that causes mental disease is

NO2
SO2
Hg
Lead

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