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Overview of General Metallurgical Processes

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Question

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

A

lower the melting point of alumina

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B

increase the electrical conductivity

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C

minimise the anode effect

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D

remove impurities from alumina

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Solution

The correct option is A lower the melting point of alumina
In the extraction of aluminium by electrolytic process, cryolite is added to reduce the melting temperature of the mixture. The use of cryolite reduces some of the energy costs involved in extracting aluminium.

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Q. In the electrolytic extraction of aluminium, the substance added to reduce the melting point of alumina is .

In the electrolytic extraction of aluminium, the substances which are not used to reduce the melting point of alumina are:

Q. (i) Name the solution used to react with Bauxite as a first step in obtaining pure aluminium oxide, in the Baeyer's process.
(ii) Write the equation for the reaction where the aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide.
(iii) Name the compound added to pure alumina to lower the fusion temperature during the electrolytic reduction of alumina.
(iv) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis.
(v) Explain why it is preferable to use a number of graphite electrodes as anode instead of a single electrode, during the above electrolysis.

Q. Function of adding cryolite in the extraction of aluminium from pure alumina is

Q. Assertion :Cryolite is employed in the extraction of aluminium. Reason: Cryolite lowers the melting point of

A l_{2} O_{3}

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