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Consider the ...

Question

Consider the following statements about the extraction of aluminium:

P: Bauxite ore is used for the extraction of aluminium.
Q: KCl used to leach alumina from bauxite in Bayer's process.
R: In Hall-Heroult process, aluminium is obtained at the cathode.

Which of the following statements are true?

A

Q and R

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B

P and Q

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C

P and R

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D

Only R

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Solution

The correct option is C P and R
Bauxite is an important ore of Aluminium. It is used for its extraction.So P is true.

NaOH is the reagent used in this process to leach the grounded bauxite ore as it selectively leeches alumina, instead of KCl.
So Q is false.

In the Hall-Heroult process, electrolysis is used to obtain Aluminium. During electrolysis, Aluminium is obtained at the cathode while CO and CO2 gases are liberated at the anode.
So, R is true.

Therefore, the correct answer is option (d).

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Similar questions

Q. Complete the following statement using every given options.
During the extraction of aluminium..............
a. Ingredients and gangue in bauxite.
b. Use of leaching during the concentration of ore.
c. Chemical reaction of transformation of bauxite into alumina by Hall’s process.
d. Heating the aluminium ore with concentrated caustic soda.

Q. The following is an extract from 'Metals in the service of man, Alexander and street / Pelican 1976' : Alumina (aluminium oxide) has a very high melting point of over 2000°C, so that it cannot readily be liquefied. However,conversion of alumina to aluminium and oxygen, by electrolysis, can occur when it is dissolved in some other substance.
(a) Which solution is used to react with bauxite as a first step in obtaining pure aluminium oxide?
(b) The aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide. Write the equation for this reaction.
(c) Name the element which serves both as the anode and the cathode in the extraction of aluminium.
(d) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium.
(e) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis.
(f) Give the equation for the reaction that occurs at the anode when aluminium is purified by electrolysis.

Q. The following is an extract from 'Metals in the Service of Man, Alexander and Street/Pelican 1976':
'Alumina (Aluminium oxide) has a very high melting point of over 2000 C so that it cannot readily be liquefied. However, conversion of alumina to aluminium and oxygen, by electrolysis, can occur when it is dissolved in some other substance'.
(a) Which solution is used to react with bauxite as a first step in obtaining pure aluminium oxide?
(b) The aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide. Write the balanced chemical equation for this reaction.
(c) Name the element which serves both as anode and the cathode in the extraction of aluminium.
(d) Write the balanced chemical equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis.
(e) Give the balanced chemical equation for the reaction which occurs at the anode when aluminium is purified by electrolysis.

Q. Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.
(a) Write three balanced equations for the purification of bauxite by Hall's process.
(b) Name a chemical used for dissolving aluminium oxide. In which state of sub-division is the chemical used?
(c) Write an equation for the reaction which takes place at the anode during the extraction of aluminium by the electrolytic process.
(d) Mention one reason for the use of aluminium in thermite welding. Which particular property of cast iron makes it unsuitable for the construction of bridges?

Q. Which among the following statement(s) is(are) true for the extraction of aluminium from bauxite?

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