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NEET CHEMISTRYP Block ElementsMedium

Question

Al2O3 can be converted to anhydrous AlCl3 by heating:

A

Al2O3 with HCl gas

B

Al2O3 with NaCl in solid-state

C

a mixture of Al2O3 and carbon in dry Cl2 gas

D

Al2O3 with Cl2 gas

Step-by-Step Solution

Anhydrous aluminium chloride (AlCl3) is prepared industrially by heating a mixture of alumina (Al2O3) and coke (carbon) in a current of dry chlorine gas. The carbon acts as a reducing agent to help break the strong Al-O bonds, combining with the oxygen to form carbon monoxide. The chemical reaction is: Al2O3 + 3C + 3Cl2 → 2AlCl3 + 3CO. Heating Al2O3 with HCl gas yields hydrated aluminium chloride, not anhydrous.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from P Block Elements. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYP Block Elementsconvertedanhydrousheating

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