p-Block Elements-I - Result Question 25
####25. $AlF _3$ is insoluble in anhydrous $HF$ but when little $KF$ is added to the compound it becomes soluble. On addition of $BF _3$, $AlF _3$ is precipitated. Write the balanced chemical equations.
(2004, 2M)
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Solution:
- $3 KF+AlF _3 \longrightarrow B _2 H _5 Cl+H _2$
$K _3 AlF _6+3 BF _3 \longrightarrow AlF _3 \downarrow+3 KBF _4$
