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

Options

A. `CO_(3)^(2-),NO_(3)^(-)`
B. `ClO_(3)^(-),CO_(3)^(2-)`
C. `SO_(3)^(2-),NO_(3)^(-)`
D. `ClO_(3)^(-),SO_(3)^(2-)`

Answer

A

Explanation

Compounds having same value of total number of electrons of are known as isoelectronic.
`{:("For"CO_(3)^(2-),"For"NO_(3)^(-)),("Total number of electrons","Total number of electrons"),(" "=6+8xx3+2," "=7+8xx3+1),(" "=6+24+2," "=7+25),(" "=32," "=32):}`
Hence, `CO_(3)^(2-)` and `NO_(3)^(-)` are isoelectronic. These two ions have similar structrue so they are isostructural.

Both have triangular planar structure as in both the species carbon and nitrogen are `sp^(2)` hybridised. Hence, (a) is the correct choice.