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NEET CHEMISTRYP Block ElementsMedium

Question

AlF3 is soluble in HF only in the presence of KF due to the formation of:

A

K3[AlF3H3]

B

K3[AlF6]

C

AlH3

D

K[AlF3H]

Step-by-Step Solution

Anhydrous HF is a covalent compound and a weak acid, so it does not provide enough F⁻ ions to dissolve AlF3. However, KF is an ionic compound that completely dissociates to provide a high concentration of F⁻ ions. In the presence of KF, AlF3 acts as a Lewis acid and accepts these F⁻ ions to form the soluble coordination complex, potassium hexafluoroaluminate(III). The chemical equation for this reaction is: AlF3 + 3KF → K3[AlF6].

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 Elementssolublepresenceformation

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