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  4. Which one forms KHX2 type compound?

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Q. Which one forms $KHX_2$ type compound?

AIIMSAIIMS 2001The p-Block Elements - Part2

Solution:

Hydrogen fluoride is an associated molecule and can be represented by $H_2F_2$. This is due to the fact that strong hydrogen bonding exists between the molecules. (as $F$ is highly electronegative element)
$H_2F_2 + KF \to KHF_2 + HF$