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Chemistry

Chemistry
________ is a by product of sewage treatment and can be decomposed to produce biogas

Scum
Sewage
Sewer
Sludge

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Chemistry
Among the following, which is always found in free-state in nature?

Sodium
Copper
Silver
Gold

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Chemistry
Maximum permissible concentration of copper in drinking water in mg/L is

0.05
2
0.01
1

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Chemistry
Which of the following is the main nitrogenous waste in humans ?

Ammonia
Urea
Ammonium Nitrate
Uric Acid

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Chemistry
The main chemical constituent of clay is

zeolites
aluminium borosilicate
aluminium silicate
silicon oxide

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Chemistry
The molecular mass of a gas is

Equal to its vapour pressure
Twice its vapour pressure
Half its vapour pressure
Not related to its vapour pressure

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