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Q.

During the electrolytic reduction of alumina, the reaction at cathode is

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a

2H2O→O2+4H++4e−

b

3F-→3F+3e−

c

Al3++3e−→Al

d

2H++2e−→H2

answer is C.

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Detailed Solution

  • The melting point of alumina is quite high. 
  • Cryolite is introduced during alumina electrolysis to lower the melting point of alumina. 
  • Cryolite also improves alumina conductivity.
  • Ionic compound aluminium oxide (Al2O3) When it is melted, it produces Al3+ and O2− ions, which are free to travel and conduct electricity. Ions are not free in the solid state and cannot carry electricity.
     
  • Alumina is reduced electrolytically.
  • Al+3+3e-−→Al.
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