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Which of the following chemical reaction represents Hall-Heroult process

Option 1 -

Cr2O3 + 2Al ® Al2O3 + 2Cr           

Option 2 -

2Al2O3 + 3C ® 4Al + 3CO2

Option 3 -

FeO + CO ® Fe + CO2

Option 4 -

2 [ A u ( C N ) 2 ] − ( a q ) + Z n ( s ) → 2 A u ( s ) + [ Z n ( C N 4 ) ] 2 −

0 2 Views | Posted 2 months ago
Asked by Shiksha User

  • 1 Answer

  • A

    Answered by

    alok kumar singh | Contributor-Level 10

    2 months ago
    Correct Option - 2


    Detailed Solution:

    In Hall Heroult process electrolysis is carried out using carbon anode. The liberated

    O2 at anode reacts with anode.

    Cathode : A l 3 + ( m e l t ) + 3 e k → A l ( l )

    Anode : C ( s ) + O 2 − ( M e l t ) → C O ( g ) + 2 e C ( s ) + 2 O 2 − ( M e l t ) → C O 2 ( g ) + 4 e

    Net Reaction 2Al2O3 + 3C 4 A l + 3 C O 2

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