What could be the \( \mathrm{X}^{-} \)in the system, Where \( \mathrm{X} \) signifies halogen ; ...

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What could be the \( \mathrm{X}^{-} \)in the system, Where \( \mathrm{X} \) signifies halogen ; formation of shown below \( \mathrm{X}_{2} \) takes place, when \( \mathrm{F}_{2} \) is purge into aqueous solution of \( \mathrm{X}^{-} \)?
(a) \( \mathrm{Br}^{-} \)
(b) \( \mathrm{Cl}^{-} \)
(c) \( \mathrm{I}^{-} \)
(d) All of these
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