Question

\(\mathrm{KF}\) combines with \(\mathrm{HF}\) to form \(\mathrm{KHF}_{2}\). This compound contains the species
(a) \(\mathrm{K}^{+}, \mathrm{F}^{+}\)and \(\mathrm{H}^{+}\)
(b) \(\mathrm{K}^{+}, \mathrm{F}^{-}\)and \(\mathrm{HF}\)
(c) \(\mathrm{K}^{+}\)and \(\left[\mathrm{HF}_{2}\right]^{-}\)
(d) \([\mathrm{KHF}]^{+}\)and \(\mathrm{F}_{2}\)

Answer 1

The correct option is (c) \(\mathrm{K}^{+}\)and \(\left[\mathrm{HF}_{2}\right]^{-} .\)
Explanation:
The fluoride ion, by a process of hydrogen bonding, forms the anion, \(\mathrm{HF}_{2}\). The compound is written as \(\mathrm{K}^{+}\left[\mathrm{HF}_{2}\right]\).