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When aluminium oxide (Al(2)O(3)) is elec...

When aluminium oxide `(Al_(2)O_(3))` is electrolysed for the production of aluminium metal. For a given quantity of electricty, the number of moles of aluminium obtained if the volume of `O_(2)` gas obtained is 201.6 litre measured at NTP, is

A

9

B

6

C

12

D

4.5

Text Solution

Verified by Experts

The correct Answer is:
C
Number of equivalents of oxygen `= (201.6)/(5.6) = 36`
(Equivalent volume of oxygen `= 5.6` litre at NTP)
`:.` Number of equivalents of `Al = 36`
Mass of aluminium `= 36 xx 9 g`
Number of moles of aluminium `= (36 xx 9)/(27) = 12`
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  • Cuyolite and fluorspar are mixed with Al_(2)O_(3) during electrolysis for extraction of aluminium to

    A
    increase the mass of the reaction mixture
    B
    get other products at anode like fluorine
    C
    lower the melting point and increase the conductivity of the electrolyte
    D
    reduce aluminium oxide by cryolite

  • 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)+CaF_(2)+NaAlF_(6)`
    C
    `Al_(2)O_(3)+Na_(3)AlF_(6)+CaF_(2)`
    D
    `Al_(2)O_(3)+KF+Na_(3)AlF_(6)`

  • 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)+CaF_(2)+NaAlF_(4)`
    C
    `Al_(2)O_(3)+Na_(3)AlF_(6)+CaF_(2)`
    D
    `Al_(2)O_(3)+KF+Na_(2)AlF_(6)`
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