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Chemistry

Chemistry
The hottest part of the gas flame is known as

non-luminous zone
blue zone
dark zone
luminous zone

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Chemistry
At room temperature, the metal that remains liquid is:

Zinc
Lead
Mercury
Platinum

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Chemistry
Copper is refined by

Electrolysis
Zone refining
Roasting
Oxidation

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Chemistry
An inert gas mixed with oxygen given to patients suffering from restricted breathing is

Helium
Argon
Radon
Krypton

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Chemistry
Burning pyrites ore gives out

Sulphur dioxide gas
Nitrogen dioxide gas
Carbon dioxide gas
Nitric oxide gas

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Chemistry
The number of moles of solute present in 1 kg of a solvent is called its

formality
normality
molarity
molality

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