Chemistry
State the electrode reaction at the respective electrodes during extraction of Al from Al2O3.
Electrolysis
19 Likes
Answer
Reaction:
Al2O3 ⇌ 2Al3+ + 3O2-
Reaction at cathode:
2Al3+ + 6e- ⟶ 2Al
Reaction at anode:
3O2- – 6e- ⟶ 3[O]
3[O] + 3[O] ⟶ 3O2
Answered By
11 Likes
Related Questions
Explain the term 'electrometallurgy'. At which electrode is the extracted metal always deposited ?
State how activity series of metals plays a role in extraction of metals from oxides.
Match the statements 1 to 5 with their answers selected from A to J.
A: Cathode, B: Sucrose soln., C: Cl1-, D : Formic acid, E: Electrometallurgy, F: Ammonia, G: Mg2+, H: Electrorefining, I: Sulphur dioxide, J: Anode.
- A compound containing molecules only.
- A compound which ionizes in soln. state but not in gaseous state.
- The ion which accepts electrons from the cathode and gets reduced to neutral atoms.
- The electrode to which the cyanide ions of aq. Na[Ag(CN)2] migrate during electrolysis.
- An application of electrolysis in which the anode does not generally diminish in size.
Complete the table given below:
Nature of Anode Nature of Cathode Ions present in electrolyte Ion/s discharged at Cathode / Anode 1. Electroplating an iron rod with silver 2. Electroplating a copper sheet with nickel 3. Electrorefining of silver 4. Extraction of potassium from KCl 5. Extraction of aluminium from Al2O3