Q. Among the following the pair in which the two species are not isostructural is
A) ${IO}_{3}^{-}\$and$\ XeO_{3}$
B) ${PF}_{6}^{-}\$and$\ SF_{6}$
C) ${BH}_{4}^{-}\$and$\ {NH}_{4}^{+}$
D) $SiF_{4}\$and$\ SF_{4}$
Explanation
(d)
${IO}_{3}^{-},XeO_{3},\$($sp^{3}$ hybridisation)$\$pyramidal
${PF}_{6}^{-}\$,$\ SF_{6}\ ({sp}^{3}d^{2})$ octahedral
${BH}_{4}^{-}\$,$\ {NH}_{4}^{+},SiF_{4}\ \left( {sp}^{3} \right)\$tetrahedral
${CO}_{3}^{2 -}\ (sp^{2})$ trigonal planar
${NO}_{3}^{-}\ (sp^{2})$ trigonal planar
$SF_{4}\ (sp^{3}d)$ $see - saw$
Hence, $SiF_{4}\$and$\ SF_{4}$ are not isostructural (same structure).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.