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Chemistry

Chemistry
Number of hydrogen atoms in a Glucose molecule

8
12
14
6

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Chemistry
Percentage of lead in lead pencils is

80
31-66
40

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Chemistry
Ultraviolet rays can be used in water treatment as

Precipitator
Flocculator
Disinfectant
Hydrolyser

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Chemistry
The fiber least prone to catch fire is

Nylon
Polyester
Terylene
Cotton

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Chemistry
Nitrification is the biological process of converting

N2 into nitrate
Ammonia into nitrite
N2into nitrite
Ammonia into N2

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Chemistry
The chief source of naphthalene is

Diesel
Camphor
Charcoal
Coal-tar

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