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Question

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

A
AlH3
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B
K[AlF3H]
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C
K3[AlF3H3]
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D
K3[AlF6]
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Solution

The correct option is D K3[AlF6]
AlF3 is insoluble in anhydrous HF because the F ions are not available in hydrogen bonded HF but, it becomes soluble in presence of little amount of KF due to formation of soluble complex

AlF3+3KFK3[AlF6]

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