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Extraction of aluminum can be understo...

Extraction of aluminum can be understood by

The purpose of adding cryolite is :

A

to increase the electrical conductivity of pure aluminium

B

to higher the melting point of `Al_(2)O_(3)`

C

to remove the impurities as slag

D

to increase he AI % in the yield

Text Solution

Verified by Experts

The correct Answer is:
A
`Na_(3) AIF_(6)` lowers the m.pt. and increases the conductance of melt.
Hence, (A) is the correct answer.
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Knowledge Check

  • Following flow diagram represent the extraction of aluminium form bauxite. The purpose of adding cryolite is :

    A
    To increase the electrical conductivity of pure aluminium
    B
    To lower the melting point of `Al_2O_3`
    C
    To remove the impurities as slag
    D
    To increase the aluminium percentage in the yield

  • Extraction of aluminum can be understood by The molten electrolytes contains Na^(+), AI^(3+), Ca^(2+) but only AI gets deposited at cathode because :

    A
    Standard reduction potential of AI is more than those of Na & Ca
    B
    Standard oxidation potential of AI is more than those of Na & Ca
    C
    Disharge potential `AI^(3+)` is higher than `Na^(+) & Ca^(2+)`
    D
    Graphite reacts only with `AI^(3+)` and not with `Na^(+) & Ca^(2+)`

  • Extraction of aluminum can be understood by Which of the following statement is/are correct ?

    A
    In Serpeck's process for the purification of bauxite, ammonia is obtained as a by product
    B
    In the Hall's process for the purification of bauxite, the ore is fused with NaOH
    C
    In Hall-Heroult's process for the reduction of alumina, a mixture of alumina, cryolite and fluorspar is used
    D
    In the Bayer's process for the purification of bauxite, the ore is digested with `Na_(2)CO_(3)`

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    Extraction of aluminium can be understood by : Electrolytric reduction of Al_(2) O_(3) : Electrolysis : Al_(2) O_(3) + Cryolite + CaF_(2) Cathode : Carbon inside the Fe container Anode : Graphite rods. The purpose of adding cryolite is.

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