Which of the following pairs of ions is isoelectronic as well as isost

1.	Which of the following pairs of ions is isoelectronic as well as isostructural ?
Answer» `CO_(3)^(2-),NO_(3)^(-)` `ClO_(3)^(-),CO_(3)^(2-)` `SO_(3)^(2-),NO_(3)^(-)` `ClO_(3)^(-),SO_(3)^(2-)` Solution :`CO_(3)^(2-)` ion has 32 electrons `(6+3xx8+2)` and C is `sp^(2)` hybridized. `NO_(3)^(-)` has 32 electrons and N is ALSO `sp^(2)`-hybridized. Thus, `CO_(3)^(2-)andNO_(3)^(-)` are isoelectronic as well as isostructural, i.e., OPTION (a) is CORRECT. `CO_(3)^(-)` ionhas 42 electrons `(17+3xx8+1)` and Cl is `sp^(3)`-hybridized, while `SO_(3)^(2-)` also has 42 electrons and S is `sp^(3)`-hybridized. Thus, `ClO_(3)^(-)andSO_(3)^(2-)` are also isoelectronic and isostructural, i.e., option (d) is correct.

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