Cryolite is used in the electrolytic extraction of aluminium, because ___________ .

it dissolves alumina

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it dissolves sodium

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it dissolves aluminium fluoride

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it decreases the solubility

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Solution

The correct option is A it dissolves alumina
In the extraction of aluminium by electrolytic process, alumina $A l_{2} O_{3}$ is used along with fluorspar and cryolite. Cryolite reduces the melting temperature of the mixture, and also act as solvent to help dissolve $A l_{2} O_{3}$ .

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Similar questions

Q. Assertion :Cryolite is used in electrolytic extraction of

A l

from alumina. Reason: It dissolves alumina.

Q. In the extraction of aluminium by electrolytic process, cryolite is added to ________.

Q. A to F below relate to the source and extraction of either zinc or aluminium.
A. bauxite
B. coke
C. cryolite
D. froth flotation
E. sodium hydroxide solution
F. zinc blende.
(a) Write down the three letters each from the above list which are relevant to:
(i) zinc
(ii) aluminium
(b) Fill in the blanks using the most appropriate words from A to F:
(i) The ore from which aluminium is extracted must first be treated with _________ so that pure aluminium oxide can be obtained.
(ii) Pure aluminium oxide is dissolved in _________ to make a conducting solution.
(c) Write the formula of cryolite.

In order to obtain 1 tonner of aluminium, the following inputs are required. 4 tonnes of bauxite, 150 kg of sodium hydroxide and 600 kg of graphite. The aluminium compound in bauxite is aluminium oxide and the main impurity is Iron (III) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.

(a) When bauxite is treated with sodium hydroxide solution, what happens to:

(i) the aluminium oxide,

(ii) the iron (III) oxide?

(b) (i) Name the process used for the purification of bauxite.

(ii) Write the equation for the action of heat on aluminium hydroxide.

(ii) Write down the word which correctly completes the following sentence.By dissolving aluminium oxide in cryolite a ..........(conducting/non conducting) solution is produced.

(iii) Why is so much graphite required for the electrolytic process?

(iv) Write the equation for the reaction which takes palace at cathode.

Q. In order to obtain one tonne of aluminium, the following inputs are required:
4 tonnes of bauxite, 150 kg of sodium hydroxide and 600 kg of graphite.
The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (III) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
(a) When bauxite is treated with sodium hydroxide solution, what happens to:
(i) the aluminium oxide?
(ii) the iron (III) oxide?
(b) (i) Name the process used for the purification of bauxite.
(ii) Write the equation to show the action of heat on aluminium hydroxide.
(c) (i) Write the formula of cryolite.
(ii) Write down the word which correctly completes the following sentence:
"By dissolving aluminium oxide in cryolite, a __________ (conducting/non-conducting) solution is produced.
(iii) Why is so much graphite required for this electrolytic process?
(iv) Write the equation for the reaction which takes place at the cathode.
(d) In construction work, why is the alloy of aluminium, duralumin used rather than pure aluminium.

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Cryolite is used in the electrolytic extraction of aluminium, because ___________ .

The correct option is A it dissolves aluminaIn the extraction of aluminium by electrolytic process, alumina Al2O3 is used along with fluorspar and cryolite. Cryolite reduces the melting temperature of the mixture, and also act as solvent to help dissolve Al2O3.

The correct option is A it dissolves alumina
In the extraction of aluminium by electrolytic process, alumina $A l_{2} O_{3}$ is used along with fluorspar and cryolite. Cryolite reduces the melting temperature of the mixture, and also act as solvent to help dissolve $A l_{2} O_{3}$ .