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Isostructural species are those which have the same shape and hybridization. Among the given species identify the isostructural pairs.
(i)\left [ NF_{3}\; and\; BF_{3} \right ]
(ii) \left [ BF{_{4}}^{-}\; and\; NH_{4}^{+} \right ]
(iii) \left [ BCl_{3}\; and\; BrCl_{3} \right ]
(iv) \left [ NH_{3}\; and\; NO{_{3}}^{-} \right ]

Answers (1)

The answer is the option (ii) \left [ BF{_{4}}^{-}\; and\; NH_{4}^{+} \right ]

Explanation: The pair above is isostructural because both the molecules \left [ BF{_{4}}^{-}\; and\; NH_{4}^{+} \right ] are sp3 hybridized and their shape is tetrahedral.

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