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Question

The chemical formula of cryolite is ____.( $N a_{3} A l F_{6} / A l_{2} O_{3}$ )

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Solution

The chemical formula of cryolite is Na₃AlF₆
Cryolite is used as a solvent for bauxite.
Cryolite reduces the temperature of Alumina and makes it a good conductor of electricity.
Synthetic cryolite is made from fluorite.

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Q. (a) Give the chemical name and formula of 'cryolite'.
(b) What is the function of cryolite in the extraction of aluminium, other than acting as a solvent for bauxite?

{F e}_{2} O_{3} + 2 A l \to {A l}_{2} O_{3} + 2 F e

The above reaction is an example of a :

Q. What is the role of cryolite (Na₃AlF₆) in the electrolytic reduction of alumina in the Hall's process?

Q. Clay, cryolite, and bauxite are the minerals of aluminium.
Which among them is the ore of aluminum? What is its chemical formula?

List I	List II
A. Calcination	a. $2 {C u}_{2} S + 3 O_{2} \to 2 {C u}_{2} O + 2 S O_{2}$
B. Roasting	b. ${F e}_{2} O_{3} \cdot n H_{2} O \to {F e}_{2} O_{3} + n H_{2} O$
C. Flux	c. ${C r}_{2} O_{3} + 2 A l \to {A l}_{2} O_{3} + 2 C r$
D. Thermite	d. $S i O_{2} + F e O \to F e S i O_{3}$

Match the following.

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