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  4. AlF3 is insoluble in anhydrous HF but when little K.F is added to the compound it becomes soluble. On addition of BFi3, AlF3 is precipitated. Write the balanced chemical equations.

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Q. $AlF_3$ is insoluble in anhydrous $HF$ but when little $K.F$ is added to the compound it becomes soluble. On addition of $BFi_3, AlF_3$ is precipitated. Write the balanced chemical equations.

IIT JEEIIT JEE 2004The p-Block Elements

Solution:

$3 KF + AlF_3 \longrightarrow B_2H_5Cl + H_2$
$K_3 AlF_6 + 3BF_3 \longrightarrow \underset{ppt}{AlF_3} \downarrow + 3KBF_4$