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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_(2)O_3` + HF + `NaAlF_4`

B

`Al_(2)O_3` + `Na_(3)AlF_6` +` CaF_2`

C

`Al_(2)O_3` + KF + `Na_(3)AlF_6`

D

`Al_(2)O_3` + HF + `NaAlF_4`

Text Solution

Verified by Experts

The correct Answer is:
A
Alumina is a bad conductor of electricity and has very high melting point , so before subjecting to electrolysis, it is mixed with flourspar `(CuF_2`) and cryolite `(Na_(3)AlF_(6))` , which lower its melting point and make it more conducting.
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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.

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Aluminium is extracted in the electrolysis of :

Anhydrous alumina (Al_(2)O_(3)) is known as

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?

DINESH PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-REVISION QUESTIONS FROM COMPETITIVE EXAMS.
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  2. Heating mixture of Cu(2)Oand Cu(2)S will give

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  3. During electrolytic refining of copper some metals , present as impuri...

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

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  5. In the extraction of copper from its sulphide ore, the metal is finall...

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  6. Which method of purification is represented by the following equation ...

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  7. Identify the alloy containing a non metal as a constitunt in it

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  8. the carbon based reduction method is not used for extraction of

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

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

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  11. Extraction of metal from the ore cassiterite involves

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  12. Which method of purification is represented by the following equation ...

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

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

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  15. In the extraction of copper from its sulphide ore, the metal is finall...

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  16. Identify the alloy containing a non metal as a constituent in it

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  17. Roasting of sulphides gives the gas X as a byproduct . This is a colou...

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  18. Sulphide ores are common for the metals

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  19. Vapour phase refining for the purification of

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  20. Aluminium is used in the extraction of

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