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Q.

Among the following pairs, in which the two species are not isostructural?

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a

${BH}_{4}^{-}$ and ${NH}_{4}^{+}$

b

${SiF}_{4}$ and ${SF}_{4}$

c

${PF}_{6}^{-}$ and ${SF}_{6}$

d

${IO}_{3}^{-}$ and ${XeO}_{3}$

answer is A.

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Detailed Solution

The two species are not isostructural are ${SiF}_{4}$ and ${SF}_{4}$ .

${SIF}_{4}$ has 4 pairs [4 bond pair] $& {SF}_{4}$ has 5 pairs [4 bond pair + 1 lone pair] so they are not isostructural.

Hence, the option A is correct.

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