Chemistry NCERT Exemplar Solutions Class 11th Chapter Three Class 12th General Principles & Processes of Isolating Elemen Chemistry Ncert Solutions Chemistry Class 12th

Which of the following chemical reaction represents Hall-Heroult process

Option 1 - <p>Cr<sub>2</sub>O<sub>3</sub> + 2Al ® Al<sub>2</sub>O<sub>3</sub> + 2Cr           </p>

Option 2 - <p>2Al<sub>2</sub>O<sub>3</sub> + 3C ® 4Al + 3CO<sub>2</sub></p>

Option 3 - <p>FeO + CO ® Fe + CO<sub>2</sub></p>

Option 4 - <p><span class="mathml" contenteditable="false"> <math> <mrow> <mn>2</mn> <msup> <mrow> <mrow> <mo>[</mo> <mrow> <mi>A</mi> <mi>u</mi> <msub> <mrow> <mrow> <mo>(</mo> <mrow> <mi>C</mi> <mi>N</mi> </mrow> <mo>)</mo> </mrow> </mrow> <mrow> <mn>2</mn> </mrow> </msub> </mrow> <mo>]</mo> </mrow> </mrow> <mrow> <mo>−</mo> </mrow> </msup> <mrow> <mo>(</mo> <mrow> <mi>a</mi> <mi>q</mi> </mrow> <mo>)</mo> </mrow> <mo>+</mo> <mi>Z</mi> <mi>n</mi> <mo stretchy="false">(</mo> <mi>s</mi> <mo stretchy="false">)</mo> <mo>→</mo> <mn>2</mn> <mi>A</mi> <mi>u</mi> <mo stretchy="false">(</mo> <mi>s</mi> <mo stretchy="false">)</mo> <mo>+</mo> <msup> <mrow> <mrow> <mo>[</mo> <mrow> <mi>Z</mi> <mi>n</mi> <mrow> <mo>(</mo> <mrow> <mi>C</mi> <msub> <mrow> <mi>N</mi> </mrow> <mrow> <mn>4</mn> </mrow> </msub> </mrow> <mo>)</mo> </mrow> </mrow> <mo>]</mo> </mrow> </mrow> <mrow> <mn>2</mn> <mo>−</mo> </mrow> </msup> </mrow> </math> </span></p>

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Alok Kumar Singh | Contributor-Level 10

7 months ago

Correct Option - 2

Detailed Solution:

In Hall Heroult process electrolysis is carried out using carbon anode. The liberated

O2 at anode reacts with anode.

Cathode : $A l^{3 +} (m e l t) + 3 e k \to A l (l)$

Anode : $\begin{array}{l} C (s) + O^{2 -} (M e l t) \to C O (g) + 2 e \\ C (s) + 2 O^{2 -} (M e l t) \to C O_{2} (g) + 4 e \end{array}$

Net Reaction 2Al2O3 + 3C $4 A l + 3 C O_{2}$

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Chemistry NCERT Exemplar Solutions Class 11th Chapter Three 2025

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