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Q.

Cryolite is chemically

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a

Na3AlF6 and is used in the electrolysis of alumina for increasing electrical conductivity

b

Na3AlF6 and is used in the electrolysis of alumina for increase the melting point of alumina

c

Na3AlF6 and is used in the electrolytic purification of alumina

d

Na3AlF6 and is used in the electrolysis of alumina

answer is A.

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Detailed Solution

cryolite is Na3AlF6 .

The molten cryolite is utilized as a solvent for aluminum oxide. After dissolving the aluminum oxide, the molten cryolite decreases the melting point of the aluminum oxide. Apart from that, it also increases the conductivity of the dissolved aluminum oxide.

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