JEE MAIN - Chemistry (2005 - No. 55)
Of the following sets which one does NOT contain isoelectronic species?
$$BO_3^{3 - }$$, $$CO_3^{2 - }$$, $$NO_3^{- }$$
$$SO_3^{2 - }$$, $$CO_3^{2 - }$$, $$NO_3^{-}$$
$$CN^{- }$$, $$N_2$$, $$C_2^{2 - }$$
$$PO_4^{3 - }$$, $$SO_4^{2 - }$$, $$ClO_4^{ - }$$
Paliwanag
In $$SO_3^{2 - }$$ no of electrons = 16 + 24 + 2 = 42
In $$CO_3^{2 - }$$ no of electrons = 6 + 24 + 2 = 32
In $$NO_3^{-}$$ no of electrons = 7 + 24 + 1 = 32
So they are not isoelectronic.
In $$CO_3^{2 - }$$ no of electrons = 6 + 24 + 2 = 32
In $$NO_3^{-}$$ no of electrons = 7 + 24 + 1 = 32
So they are not isoelectronic.