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Electrolytic reduction of alumina to alu...

Electrolytic reduction of alumina to aluminium by Hall - Herault process is carried out

A

in the presence of NaCl

B

in the presence of fluorite

C

in the presence of cryolite which forms a melt with lower melting temperature

D

in the presence of cryolite which forms a melt with higher melting temperature

Text Solution

Verified by Experts

The correct Answer is:
C
lectrolytic reduction of alumina to aluminium is carried out in the presence of cryolite `(Na_(3) AIF_(6))` which decreases the M.pt of `Al_(2)O_(3)`
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Knowledge Check

  • The function of adding cryolite in the electrolytic reduction of alumina by Hall Herault process is

    A
    Dissolve alumina
    B
    Lower the melting point of alumina
    C
    Lower the fuel boiling point
    D
    Increase the electrical conductivity of alumina

  • The function of adding cryolite in the clectrolytic reduction of alumina by Hall–Héroult process is to

    A
    dissolve alumina
    B
    lower the melting point of alumina
    C
    Lower the fuel boiling point
    D
    increase the electrical conducitity of alumina

  • Roosting is carried out to

    A
    convert sulphide to oxide and sulphate
    B
    remove water of hydration
    C
    melt the ore
    D
    remove arsenic and sulphur impurities

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