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Why cryolite is mixed with alumina durin...

Why cryolite is mixed with alumina during its electrolysis?

Text Solution

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Cryolite is added to alumina:
(i) to decrease its melting point from 2273 to 1173 K. (ii) to increase its conductivity.
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Knowledge Check

  • Which of the following is obtained at anode during the electrolysis of lead bromide ?

    A
    Pb
    B
    `Br_2`
    C
    Both 1 and 2
    D
    None of these

  • 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

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    Answer the following questions based on the ectraction of aluminium from alumina by Hall - Heroult's Process. What is the function of cryolite used along with alumina as the electrolyte.

    Explain the following: A neutral gas other than oxygen is formed at the anode during electrolysis of fused alumina.

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    Name the cation formed during electrolysis of water.

    Name the gas that is produced in the following case : At the anode during the electrolysis of acidified water.

    Give reason why : Is a neutral gas other than oxygen formed at the anode during electrolysis of fused alumina ?

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