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Aluminium is extracted from Alumina (Al(...

Aluminium is extracted from Alumina (`Al_(2)O_3` ) by electrolysis of a molten mixture of

A

`Al_2O_3+HF + NaAlF_4`

B

`Al_2 O_3 + CaF_2 + NaAlF_4`

C

`Al_2O_3 + Na_3 AlF_6 + CaF_2`

D

`AI_2O_3 +KF+ Na _3 AIF_6`

Text Solution

Verified by Experts

The correct Answer is:
C
Fused alumina `(Al_2 O_3)` is a bad conductor of electricity. Therefore, cryolite `(Na_3 AlF_6)` and fluorspar `(CaF_2)` are added to purified alumina which not only make alumina a good conductor of electricity but also reduce the melting point of the mixture to around 1140 K.
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Aluminium is extracted from alumina ( Al_2O_3 ) by electrolysis.

Aluminum is exteracted from alumine AI_(2)O_(3) by electrolysis of a molten mixture of :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Aluminium is extracted from bauxite by the electrolysis of molten mixture of Al_(2)O_(3) 3 with cryolite. Reason (R) : The oxidation state of Al in cryolite is + 3. In the light of the above statements, choose the most appropriate answer from the options given below:

Aluminium is obtained from Al_(2)O_(3) by _____reduction.

Extraction OF Aluminium (Al)

Aluminium is extracted in the electrolysis of :

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Aluminium oxide, Al_(2)O_(3) is

Aluminium is produced commercially by the electrolysis of Al_(2)O_(3) . How many hours would be required to produce 250 g of Al usinga 5.00 ampere current?

DISHA PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-EXERCISE -1: CONCEPT APPLICATOR
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  3. Consider the following statements - In the aluminothermite process,...

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  4. Which statement is correct?

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  5. Aluminium is prepared in large quantities by

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  6. The incorrect statement among the following is

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  7. Select the property which forms the basis of hydrometallurgical proces...

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  8. which of the following electronts is present as the impurity to the m...

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  9. Which of the following pairs of metals uis purified by van arkel meth...

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  11. Aluminium is extracted from Alumina (Al(2)O3 ) by electrolysis of a mo...

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  12. Which ore of the following is a mineral of iron ?

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  13. In the exteraction of copper from its sulphide ore, the metal is fanal...

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  14. 'Metals are usually not found as nitrates in their ores''. Out of the ...

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  15. In the exteraction of copper from its sulphide ore, the metal is fanal...

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  16. Aluminium is extracted from Alumina (Al(2)O3 ) by electrolysis of a mo...

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  17. Which ore of the following is a mineral of iron ?

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  18. In the exteraction of copper from its sulphide ore, the metal is fanal...

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  19. 'Metals are usually not found as nitrates in their ores''. Out of the ...

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  20. In the exteraction of copper from its sulphide ore, the metal is fanal...

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