1.

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»

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



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