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Chemistry

Chemistry
Percentage of lead in lead pencils is

80
40
31-66

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Chemistry
Which of the following is secondary air pollutant ?

Photochemical smog
SO2
Dust particles
NO2

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Chemistry
Chloroform can be used as

Antibiotic
Anaesthetic
Analgesic
Antimalarial

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Chemistry
White coal is

None of these
Uranium
Diamond
Hydro-electricity

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Chemistry
The metal chiefly used for galvanising iron is :

Cadmium
Mercury
Tin
Zinc

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Chemistry
Which among the following is liquid non-metal ?

Water
Bromine
Alcohol
Mercury

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