A) \[NaF+CaC{{l}_{2}}\]
B) \[KH{{F}_{2}}+LiF\]
C) \[KF+LiH{{F}_{2}}\]
D) \[CaC{{l}_{2}}+KF\]
Correct Answer: B
Solution :
In Dennis method the fluorine is prepared by the electrolysis of fused sodium or potassium hydrogen fluoride. \[KH{{F}_{2}}\xrightarrow{{}}KF+HF\] \[HF\xrightarrow{{}}{{H}^{+}}+{{F}^{-}}\] \[2{{H}^{+}}+2{{e}^{-}}\xrightarrow{{}}{{H}_{2}}\](at cathode) \[2{{F}^{-}}-2{{e}^{-}}\xrightarrow{{}}{{F}_{2}}\](at anode) Fluorine liberated at the anode is passed through the tube containing lithium or sodium fluoride. This removes the hydrogen fluoride vapours coming with fluorine. \[LiF+HF\xrightarrow{{}}LiH{{F}_{2}}\]
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