JEE Main · 2020 · 03 Sep 2020 · Shift 2 · d and f Block Elements

The incorrect statement is

(A)In manganate and permanganateions, the $π$ - bounding takes place by overlap of p-orbitals of oxygen and d - orbitals of manganese
(B)Manganate ion is green in colour and permanganateion is purple in colour
(C)Manganate and permanganate ions are paramagnetic✓ Correct
(D)Manganate and permanganate ions are tetrahedral

Answer: (C)

Solution

In both the manganate and permanganate ions the

π

bonding comes from overlap of oxygen

p

orbitals with manganese

d

orbitals, so that statement stands. Manganate is green and permanganate purple, and both ions are tetrahedral, so those stand too. The flaw is in the magnetic claim: manganate has

M n

d^{1}

with one unpaired electron and so is paramagnetic, but permanganate has

M n

d^{0}

with no unpaired electrons and so is diamagnetic. The statement that both are paramagnetic is the incorrect one.

JEE Main · 2020 · 03 Sep 2020 · Shift 2 · Single correct option

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JEE Main · 2020 · 03 Sep 2020 · Shift 2 · d and f Block Elements

Solution

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