JEE Main 202224 JuneEvening Shift

Exam: JEE Main
Year: 2022
Date: 24 June
Shift: Evening Shift
Subject: Chemistry
Chapter: General Principles and Processes of Isolation of Metals

JEE Main 2022 · 24 June · Evening Shift · Chemistry · General Principles and Processes of Isolation of Metals

Which of the following chemical reactions represents Hall-Heroult...

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

Options

A ${Cr}_{2}{O}_{3} + 2Al \to {Al}_{2}{O}_{3} + 2Cr$
B $2{Al}_{2}{O}_{3} + 3C \to 4Al + 3{CO}_{2}$
C $FeO + CO \to Fe + {CO}_{2}$
D $2{\left[Au{\left(CN\right)}_{2}\right]}^{-}\left(aq\right) + Zn\left(s\right) \to 2Au\left(s\right) + {\left[Zn\left({CN}_{4}\right)\right]}^{2 -}$

Correct answer

B. $2{Al}_{2}{O}_{3} + 3C \to 4Al + 3{CO}_{2}$

Step-by-step solution

The Hall–Héroult process is the major industrial process for smelting aluminium. It involves dissolving aluminium oxide (alumina) (obtained most often from bauxite, aluminium's chief ore, through the Bayer process) in molten cryolite, and electrolyzing the molten salt bath, typically in a purpose-built cell.

In this process carbon electrodes are used.

The following reactions take place

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

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