NEET 2017 · ChemistryVSEPR shapePrevious Year Question

Which of the following pairs of ions is isoelectronic and isostructural?

Answer: (A) $CO X_{3} X^{2 -}$ , $NO X_{3} X^{-}$ . \textbf{Answer:} (A) $CO X_{3} X^{2 -}$ , $NO X_{3} X^{-}$ \textbf{Solution:} $CO X_{3} X^{2 -}$ and $NO X_{3} X^{-}$ both have 32 electrons (24 valence) and are trigonal planar ( $sp X^{2}$ central atom), so they are both isoelectronic and isostructural; the other pairs differ in electron count and/or shape.

A. $CO X_{3} X^{2 -}$ , $NO X_{3} X^{-}$ ✓
B. $ClO X_{3} X^{-}$ , $CO X_{3} X^{2 -}$
C. $SO X_{3} X^{2 -}$ , $NO X_{3} X^{-}$
D. $ClO X_{3} X^{-}$ , $SO X_{3} X^{2 -}$

Correct Answer

(A) $CO X_{3} X^{2 -}$ , $NO X_{3} X^{-}$

Solution & Explanation

\textbf{Answer:} (A) $CO X_{3} X^{2 -}$ , $NO X_{3} X^{-}$ \textbf{Solution:} $CO X_{3} X^{2 -}$ and $NO X_{3} X^{-}$ both have 32 electrons (24 valence) and are trigonal planar ( $sp X^{2}$ central atom), so they are both isoelectronic and isostructural; the other pairs differ in electron count and/or shape.

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