In Hall's process , in the production of `Al,` carbon is used as the anode material. The reactions are

Options

A. Anode `: Al^(3+)+3e^(-) rarr Al`
Cathode `:C(s)+2O^(2-) rarr CO_(2)(s)+4e^(-)`
B. Anode`:C(s)+2O^(2-) rarr CO_(2)(g)+4e^(-)`
Cathode `:Al^(3+)+3e^(-) rarrAl`
C. Anode `: Alrarr Ae^(3+)+e^(-)`
Cathode `:CO_(2)+4e^(-) rarr C(s)+2O^(2-)`
D. None of these

Answer

b

Explanation

In the production of `Al(` in Hall's process `)`, reactions are `,`
Cathode `: Al^(3+)+3e^(-) rarr Al`
Anode `:2O^(2-) rarr O_(2)+4e^(-)`
`C+O_(2) rarr CO_(2)`