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Chemistry

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

Uric Acid
Urea
Ammonia
Ammonium Nitrate

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Chemistry
Major portion of the earth’s crust is mainly constituted by

Oxygen and Silicon
Silicon and Iron
Silicon and Aluminium
Oxygen and Iron

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Chemistry
Ultraviolet rays can be used in water treatment as

Flocculator
Disinfectant
Precipitator
Hydrolyser

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Chemistry
Soap helps in better cleaning of clothes because

It gives strength to solution
It reduces the surface tension of solution
Soap acts like catalyst
It absorbs the dirt

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Chemistry
A mixture of water and alcohol can be separated by

Decantation
Filtration
Evaporation
Distillation

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Chemistry
When quick lime is added to water

Heat is liberated
Temperature decreases
No heat change takes place
Heat is absorbed

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