Question

Which one forms $KH{X}_2$ type compound?

• A. HF
• B. HCl
• C. HI
• D. HBr

Answer 1

Answer: (A)

Hydrogen fluoride is an associated molecule and can be represented by $H_2{F}_2$. This is due to the fact that strong hydrogen bonding exists between the molecules. (as $F$ is highly electronegative element)
$H_2{F}_2+KF\to KH{F}_2+HF$