​ Reaction involved in the Hall-Herault process. (1) Ag + O2 + H2O + NaCN Na[Ag(CN)2]+ NaOH ​

Question

Reaction involved in the Hall-Herault process.

(1) Ag + O₂ + H₂O + NaCN \(\longrightarrow \)Na[Ag(CN)₂]+ NaOH

(2) SnO + C \(\overset{\Delta}{\longrightarrow}\) Sn + CO

(3) Al₂O₃ + C \(\overset{\Delta}{\longrightarrow}\) AI + CO

(4) Cu₂O + Cu₂S \(\overset{\Delta}{\longrightarrow}\) Cu + SO₂

Answer 1

Correct option is (3) Al₂O₃ + C \(\overset{\Delta}{\longrightarrow}\) AI + CO

Anode:

2O^-2 \(\longrightarrow\) O₂ + 4e
2C + O₂ \(\longrightarrow\) 2CO 

Cathode:

Al⁺³ + 3e^- \(\longrightarrow\) Al