In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to :

minimise the heat loss due to radiation

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protect aluminium produced from oxygen

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dissolve bauxite and render it conductor of electricity

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lower the melting point of bauxite

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Solution

The correct option is D dissolve bauxite and render it conductor of electricity
In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to dissolve bauxite and render it a conductor of electricity.

Hence the correct option is C.

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Similar questions

Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then metal is extracted from it by electrolytic reduction.

Mention one reason for the use of aluminium in thermite welding.

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.

In the process of extraction of Aluminium, Bauxite is mixed with cryolite so as to -

Q. In the extraction of aluminium ;
(i) name the process of concentration of bauxite.
(ii) write the cathode reaction in electrolytic reduction of alumina.
(iii) write the function and chemical formula of cryolite.
(iv) write a chemical equation for the action of heat on aluminium hydroxide.
(v) why is it necessary to replace anodes time to time?

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In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to :

The correct option is D dissolve bauxite and render it conductor of electricityIn the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to dissolve bauxite and render it a conductor of electricity.Hence the correct option is C.

The correct option is D dissolve bauxite and render it conductor of electricity
In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to dissolve bauxite and render it a conductor of electricity.

Hence the correct option is C.