Which of the following is a pseudohalogen? (a) \( \mathrm{IF}_{7} \) (b) \( \mathrm{CN}^{-} \) (...

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Which of the following is a pseudohalogen?
(a) \( \mathrm{IF}_{7} \)
(b) \( \mathrm{CN}^{-} \)
(c) \( \mathrm{ICl}_{2} \)
(d) \( \mathrm{I}_{3}^{-} \)
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