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Chemistry

Chemistry
Which one is heaviest naturally-occurring element of the periodic element

Uranium
Thorium
Iron
Rhodium

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Chemistry
The method of concentrating the ore which makes use of the difference in density between ore and impurities is called

levigation
leaching
liquation
magnetic separation

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

Softening
Disinfection
Sedimentation
Coagulation

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

Electrolyte
Anode
Cathode
Vessel

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Chemistry
Chile saltpeter is the common name of:

Sodium nitrite
Potassium nitrate
Potassium nitrite
Sodium nitrate

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Chemistry
The gas produced in marshy places due to decomposition of vegetation is

Methane
Sulphur dioxide
Carbon dioxide
Carbon monoxide

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