2019 The d- and f-Block ElementsPotassium Permanganate – Structure of Manganate and Permanganate Ions Medium Question 26 of 76 in The d- and f-Block Elements

The manganate and permanganate ions are tetrahedral, due to

A The $\pi$-bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese
B There is no $\pi$-bonding
C The $\pi$-bonding involves overlap of p-orbitals of oxygen with p-orbitals of manganese
D The $\pi$-bonding involves overlap of d-orbitals of oxygen with d-orbitals of manganese

The answer is A.

Solution

In both manganate ($MnO_4^{2-}$) and permanganate ($MnO_4^-$) ions, Mn is tetrahedrally surrounded by O atoms. The π-bonds are of $d\pi-p\pi$ type, i.e. formed by overlap of p-orbitals of oxygen with d-orbitals of manganese.

Concept pπ-dπ bonding in MnO4 ions

The d- and f-Block Elements in past papers

76 questions from this chapter have appeared across 27 exam years.