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Chemistry

Chemistry
Sour milk contains

Tartaric acid
Citric acid
Lactic acid
Acetic acid

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Chemistry
In drinking water supply, which of the following treatments is not involved

Softening
Sedimentation
Coagulation
Disinfection

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Chemistry
Biofertilizers convert nitrogen to ________ .

Amino acids
Nitrogenase
Ammonia
Nitrates

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Chemistry
In electro-refining, the pure metal is deposited on

Cathode
Electrolyte
Vessel
Anode

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Chemistry
Phosphorus is kept in water because

Its ignition temperature is very low
Its critical temperature is high
Its critical temperature is low
Its ignition temperature is very high

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Chemistry
The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is

ozone
oxygen
helium
methane

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