Assertion :`SO_(2),NO_(3)^(-) ` and `CO_(3)^(2-)` are isoelectronic as well as isostructural species.
Reason :The d and f-orbital do not shield the nuclear charge very effectively. Therefore there is signified rediduction in the size of the ions, just after d or f orbital have been completely filled.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.

Answer

d

Explanation

`S_(1): SO_(2),NO_(3)^(-)` and `CO_(3)^(2-)` have number of electron (i.e. `32`) but have difference molecular geometry.

`S_(2)` the d - and f orbital do not sheild the nuclear charge very effectively .Therefore there is significant reduction in the size of teh ions after d or f-orbital have been completely filled .This is called lanthanide contraction.