The manganate and permanganate ions are tetrahedral, due to :
(1) The $\pi$-bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese
(2) There is no $\pi$-bonding
(3) The $\pi$-bonding involves overlap of p-orbitals of oxygen with p-orbitals of manganese
(4) The $\pi$-bonding involves overlap of d-orbitals of oxygen with d-orbitals of manganese
(1) The $\pi$-bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese
(2) There is no $\pi$-bonding
(3) The $\pi$-bonding involves overlap of p-orbitals of oxygen with p-orbitals of manganese
(4) The $\pi$-bonding involves overlap of d-orbitals of oxygen with d-orbitals of manganese