Which of the given anion is highly unstable? (a) \( \mathrm{F}^{-} \) (b) \( \mathrm{O}^{-} \) (...

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Which of the given anion is highly unstable?
(a) \( \mathrm{F}^{-} \)
(b) \( \mathrm{O}^{-} \)
(c) \( \mathrm{Be}^{-} \)
(d) \( \mathrm{Cl}^{-} \)
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