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  • Which of the following chemical reactions represents Hall-Heroult Process?Option: 1 <img alt="\mathrm{Cr_{2}O_{3}+2Al\rightarrow Al_{2}O_{3}+2Cr}" sr

Which of the following chemical reactions represents Hall-Heroult Process?

Option: 1

\mathrm{Cr_{2}O_{3}+2Al\rightarrow Al_{2}O_{3}+2Cr}


Option: 2

\mathrm{2Al_{2}O_{3}+3C\rightarrow 4Al+3CO_{2}}


Option: 3

\mathrm{FeO+CO\rightarrow Fe+CO_{2}}


Option: 4

\mathrm{2[Au(CN)_{2}]_{(aq)}^{-}+Zn(s)\rightarrow 2Au(s)+[Zn(CN_{4})]^{2-}}


Answers (1)

best_answer

Hall - Heroult process is used in the electrolytic refining of Aluminium.

A steel vessel with the lining of carbon and graphite rods is used in the process. The carbon lining acts as cathode while graphite acts as anode.

The overall reaction occuring in the process can be represented as

2 \mathrm{Al}_{2} \mathrm{O}_{3}+3 \mathrm{C} \rightarrow 4 \mathrm{Al}+3 \mathrm{CO}_{2}

Option (2) is correct.

Posted by

Kuldeep Maurya

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