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Question

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

A
ClO3,SO23
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B
ClO3,CO23
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C
CO23,NO3
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D
SO23,NO3
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Solution

The correct option is C CO23,NO3
NO3(5+3×6+1)=24
CO23 have 24 electrons. (4+3×6+2=24)
Thus they have 24 electrons and hence are isoelectronic. Further, both CO3 and NO3 ions are planar and hence isostructural since-both C and N are sp2 hybridized. They have trigonal planar geometry.

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