Question

$KF$ combines with $HF$ to form $KH{F}_2$. The compound contains the species:

• A. $K^{+},F^{+}$ and $H^{+}$
• B. $K^{+},F^{-}$ and $HF$
• C. $K^{+}$ and $[H{F}_2{]}^{-}$
• D. $[KHF{]}^{+}$ and $F_2$

Answer 1

Answer: (C)

The reaction is:
$KF+HF\to KH{F}_2$
It is formed due to $H$-bond. $K^{+}{F}^{-}----H-F$ (-- is $H$-bond)
So, the compound contains $K^{+}$and ${\left[H{F}_2\right]}^{-}$ions.