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NEET UG CHEMISTRY MCQ: GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
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Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out
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Correct option: C
In the presence of cryolite which forms a melt with lower melting point
Option C is correct because cryolite (Na3AlF6) lowers the melting point of alumina and increases its conductivity, facilitating electrolysis.
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Assertion (A): Wolframite impurities are separated from cassiterite by electromagnetic separation.
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Reason (R): Cassiterite being magnetic is attracted by the magnet and forms a separate heap. Which one is an ore of sodium? Aluminothermic process is used for the extraction of metals, whose oxides are: In the extraction of copper, the metal formed in the Bessemer’s converter is due to the reaction: