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Chemistry

Chemistry
The gas used to dilute oxygen for breathing by deep sea divers is:

Helium
Argon
Neon
Nitrogen

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Chemistry
The fundamental particles present in the nucleus of an atom are

Neutron, electron
Neutron, positron
Proton, neutron
Electron, proton

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Chemistry
Citric acid is present in free form in

Lemon
Apple
Tamarind
Milk

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Chemistry
Copper is refined by

Roasting
Electrolysis
Oxidation
Zone refining

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Chemistry
Nylon is made up of :

Polyester
Polyethylene
Polypropylene
Polyamide

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Chemistry
Isobars are lines joining places having equal

Population
Pressure
Height above sea-level
Rainfall

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