Cryolite is added to alumina as to lower the fusion temperature and make the mass good conductor of electricity.

True

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False

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Solution

The correct option is A True
Aluminium oxide has a very high melting point (over 2,000C), so it would be expensive to melt it. Instead, it is dissolved in molten cryolite, an aluminium compound with a lower melting point than aluminium oxide. The use of cryolite reduces some of the energy costs involved in extracting aluminium.

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Similar questions

Cryolite is added to alumina to reduce its:

Q. The major role of fluorspar

(C a F_{2})

which is added in small quantity in the electrolytic reduction of alumina dissolved in fused cryolite

(N a_{3} A l F_{6})

is :
I. to act as a catalyst
II. to make the fused mixture very conduction
III. to lower the temperature of melting
IV. to decrease the rate of oxidation of carbon at the anode

Q. In the electrolysis of alumina, cryolite is added to ______________.

The role of fluorspar $(C a F_{2})$ which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite $(N a_{3} A l F_{6})$ is:

Q. During electrolytic reduction of alumina, two auxiliary electrolytes X and Y are added to increase the electrical conductance and lower the temperature of melt in order to make fused mixture very conducting. X and Y are :

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