question_answer

Which of the following pairs of ions are isoelectronic and isostructural?                                   [NEET 2015]

A)  \[CO_{3}^{2-},SO_{3}^{2-}\]           

B)  \[ClO_{3}^{-},\,CO_{3}^{2-}\]

C)  \[SO_{3}^{2-},NO_{3}^{-}\]        

D)       \[ClO_{3}^{-},SO_{3}^{2-}\]

Correct Answer: D

Solution :

\[CIO_{3}^{-},=SO_{3}^{2-}\]

Number of electrons

\[CO_{3}^{2-}=6+2+24=32\]

\[SO_{3}^{2-}=16+2+24=42\]

\[CIO_{3}^{-}=17+24+1=42\]

\[CO_{3}^{2-}=6+24+2=32\]

\[NO_{3}^{2-}=7+2+24=33\]

Hence, \[CIO_{3}^{-}\] and \[SO_{3}^{2-}\] are isoelectronic and are pyramidal in shape.