Topic: K2Cr2O7 and KMnO4· d- and f-Block Elements

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

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Answer: 1. The \(\pi\)-bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese

In \(\mathrm{MnO_4^-}\) and \(\mathrm{MnO_4^{2-}}\), Mn uses \(sp^3\) hybrid orbitals for \(\sigma\) bonds. Extra \(\pi\) bonding comes from overlap of filled p-orbitals of oxygen with empty d-orbitals of manganese (\(p\pi\)-\(d\pi\) bonding). Oxygen has no d-orbitals, so options (3) and (4) are wrong and (2) is wrong as well. Answer: option (1).

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The manganate and permanganate ions are tetrahedral, due to :

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