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Extraction of Aluminium

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Question

The following questions are relevant to the extraction of aluminium:
State the reason for addition of caustic alkali to bauxite ore during purification of bauxite.

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Solution

Bauxite is amphoteric oxide. It dissolves in $N a O H$ solution i.e caustic alkali. But other impurities that are present such as $F e_{2} O_{3}$ and $S i O_{2}$ are not amphoteric in nature and hence will not dissolve in caustic alkali. So caustic alkali is used.

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We add caustic alkali to bauxite ore during purification of bauxite.

Reason: Bauxite dissolves in caustic alkali and thus impurities can be separated

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. 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. During extraction of aluminium from bauxite:

Q. Ore is used for the extraction of metals profitably. Bauxite is used to extract aluminium, it can be termed as_________.

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