JEE Main & Advanced Chemistry The p-block Elements-II Question Bank Halogen Family

  • question_answer
    Fluorine is prepared by

    A) Oxidation of \[HF\]

    B) Electrolysis of \[KF\]

    C) Electrolysis of fused \[KH{{F}_{2}}\]

    D) Decomposition of \[Hg{{F}_{2}}\]

    Correct Answer: C

    Solution :

    \[KH{{F}_{2}}\,\to \,KF+HF\]   \[KF\,\to \,{{K}^{+}}+{{F}^{-}}\] At cathode : \[{{K}^{+}}+{{e}^{-}}\,\to \,K\]        \[2K+2HF\,\to \,2KF+{{H}_{2}}\] At anode : \[{{F}^{-}}\,\to \,F+{{e}^{-}}\]                 \[F+F\,\to \,{{F}_{2}}\]

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