question_answer

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

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.