Chemistry - Metallurgy Question with Solution | TestHub

ChemistryMetallurgyExtraction of MetalsMedium2 minQB

ChemistryMediummultiple choice

Passage / Comprehension

The Bayer Process for alumina, as we know it today, involves two steps:

1. The pressure leaching of bauxite with NaOH solution.

2. The precipitation of pure aluminum hydroxide from solution by seeding with fine crystals of Al(OH)₃.

Select CORRECT for Hall-Heroult process used for the extraction of Al :-

Answer:

A, B

Solution:

In the Hall–Héroult process, Al³⁺ ions are reduced at the cathode to form molten aluminium, so (A) is correct.

At the anode, O²⁻ ions are oxidized to oxygen, which reacts with carbon anodes forming CO₂ (and sometimes CO), so (B) is correct.

Aluminium, being denser, is collected at the bottom of the cell, not top, so (C) is incorrect.

The electrolyte (cryolite + CaF₂) actually has lower melting point than pure Al₂O₃, so (D) is incorrect.

Stream:JEESubject:ChemistryTopic:MetallurgySubtopic:Extraction of Metals

⏱ 2mℹ️ Source: QB

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