First slide

Electronic configuration and Atomic , physical properties

Question

Fluorine is prepared by

Moderate

A

Oxidation of HF
B

Electrolysis of KF
C

Electrolysis off fused ${KHF}_{2}$
D

Decomposition of ${HgF}_{2}$

Solution

$\begin{array}{l} {KHF}_{2} \to KF + HF \\ KF \to K^{+} + F^{-} \end{array}$
At cathode: $K^{+} + e^{-} \to K$
$2 K + 2 HF \to 2 KF + H_{2}$
At anode: $F^{-} \to F + e^{-}$
$F + F \to F_{2}$

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