pBlock ElementsII 2 Question 18
18. $\mathrm{KF}$ combines with $\mathrm{HF}$ to form $\mathrm{KHF}_{2}$. The compound contains the species
(1996, 1M)
(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 $\mathrm{F}^{-}$
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Solution:
- All others has at least one S-S linkage.
$$ \mathrm{KF}+\mathrm{HF} \longrightarrow \mathrm{K}^{+}+\mathrm{HF}_{2}^{-} $$
