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ICSE Class 10 Chemistry Question 7 of 23

Solved Sample Paper 1 — Question 13

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13
Question

Question 1(xiii)

During electrolytic reduction of molten alumina, aluminium metal is obtained at

  1. carbon cathode
  2. carbon anode
  3. aluminium anode
  4. aluminium cathode
Answer

carbon cathode

Reason — At cathode :

2Al3+ + 6e- ⟶ 2Al

At anode : 3O2- - 6e- ⟶ 3[O] ⟶ 3O2

Al3+ are discharged in preference to Na1+ and Ca2+ ions due to it's lower position in the electrochemical series.