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JEE Main 201212 MayOnline

Exam: JEE Main
Year: 2012
Date: 12 May
Mode: Online
Subject: Chemistry
Chapter: General Principles and Processes of Isolation of Metals

JEE Main 2012 · 12 May · Online · Chemistry · General Principles and Processes of Isolation of Metals

In the electrolysis of alumina to obtain aluminium metal, cryolite...

In the electrolysis of alumina to obtain aluminium metal, cryolite is added mainly to

Options

Alower the melting point of alumina
Bdissolve alumina in molten cryolite
Cremove the impurities of alumina
Dincrease the electrical conductivity

Correct answer

A. lower the melting point of alumina

Step-by-step solution

Fused alumina

\left(\mathrm{Al}_2 \mathrm{O}_3\right)

is a bad conductor of electricity. Therefore, cryolite \left(\mathrm{Na}_3 \mathrm{AlF}_6\right)

and fluorspar \left(\mathrm{CaF}_2\right)

are added to purified alumina which not only make alumina a good conductor of electricity but also reduce the melting point of the mixture to around

1140 \mathrm{~K}

.

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