1.

Which of the following pairs of ions is isoelectronic as well as isostrutural ?

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 + 3 `xx` 8 + 2) and C is `sp^(2)` hybridized. `NO_(3)^(-)` has 32 electrons and N is also `sp^(2)`-hybridized. Thus, `CO_(3)^(2-) and NO_(3)^(-)` are ISOELECTRONIC as well as isostructural, i.e., OPTION (a) is correct.
`ClO_(3)^(-)` ion has 42 electrons (17 + 3 `xx` 8 + 1) and Cl is `sp^(3)`-hybridized, while `SO_(3)^(2-)` also has 42 electrons and S is `sp^(3)`-hybridized. Thus, `ClO_(3)^(-) and SO_(3)^(2-)` are also isoelectronic and isostructural, i.e., option (d) is correct.


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