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Extraction of Aluminium

In Hall's pro...

Question

In Hall's process the ore is leached by heating it with .

A

sodium bicarbonate

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B

sodium carbonate

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C

sodium hyroxide

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Solution

The correct option is B sodium carbonate
In Hall's process the powdered ore is leached by heating it with sodium carbonate to form sodium aluminate. The reaction involved is:
${Al}_{2} O_{3} . H_{2} O(s) + {Na}_{2} {CO}_{3} (aq) \to 2 {NaAlO}_{2} (aq) + {CO}_{2} (g) + H_{2} O(l)$

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Q. Aluminium is prepared industrially by Hall-Heroult process. Various steps in the concentration of ore are given below . Write them in the correct order.
i. The precipitate formed is separated , washed and strongly heated to get alumina.
ii. Crushed bauxite is leached with hot sodium hydroxide solution.
iii. Impurities are removed from the sodium aluminate solution for filtration.
iv. Solution is diluted after adding a little aluminium hydroxide , to precipitate aluminium hydroxide.

Q. Gold ore is concentrated by leaching with ________.

A g_{2} S

is carried out by heating it with a dilute solution of:

Q. Which of these statements are correct regarding the leaching process?
P: It involves the treatment of ore with a suitable reagent to make it soluble.
Q: During leaching, impurities remains insoluble, and the ore is not recovered from the solution by evaporation.
R: Leaching offers excellent chemical selectivity and flexibility throughout the process.

Q. Which metal is leached from its ore by the use of

K C N

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Extraction of Aluminium

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