Pblock Elementsii Result Question 18
18. KF combines with HF to form $\mathrm{KHF} _2$. The compound contains the species
$(1996,1 M)$
(a) $\mathrm{K}^{+}, \mathrm{F}^{-}$ and $\mathrm{H}^{+}$
(b) $\mathrm{K}^{+}, \mathrm{F}^{-}$ and $\mathrm{HF}$
(c) $\mathrm{K}^{+}$ and $ [\mathrm{HF} _2\ ]^{-}$
(d) $[\mathrm{KHF}]^{+}$ and $\mathrm{F}^{-}$
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Answer:
Correct Answer: 18. ( c )
Solution:
All others has at least one $S-S $ linkage.
$ \mathrm{KF}+\mathrm{HF} \quad \mathrm{K}^{+}+\mathrm{HF}^- _2 $
BETA
