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Chemistry

Grade-10

Easy

Question

Aluminum is extracted by:

Increasing the temperature of sodium aluminum silicate
Under pressure, cryolite is treated with a sodium hydroxide solution.
In a furnace, aluminum oxide is heated with coke.
In fused cryolite, molten aluminum oxide is electrolyzed.

hint Hint:

Hall Heroult process is used to Extract Alluminium from allumina.

The correct answer is: In fused cryolite, molten aluminum oxide is electrolyzed.

A process called Hall Heroult process is used to Extract alluminum from its ore.

Molten allumina cryolite and flourspar are used as electrolytes

A small voltage of 5 - 6 volts is used to prevent decomposition of cryolite

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