The incorrect statement is : - Vidyadip

MCQ

The incorrect statement is :

A
In manganate and permanganate ions, the $\pi$ $-$bonding takes place by overlap of $p-$orbitals of oxygen and $d-$orbitals of manganese
B
Manganate ion is green in colour and permanganate ion in purple in colour
✓
Manganate and permanganate ions are paramagnetic
D
Manganate and permanganate ions are tetrahedral

✓

Answer

Correct option: C.

Manganate and permanganate ions are paramagnetic

c
Option $1)$ Manganate $\Rightarrow MnO _{4}^{2-}$

Permanganate $\Rightarrow MnO _{4}^{-}$

$2 \times 2 P _{\pi}-3 d _{\pi}$

$1 \times 2 P _{\pi}-4 P _{\pi}$

$(2)$ $MnO _{4}^{2-} \Rightarrow$ green

$MnO _{\stackrel -4} \Rightarrow$ purple/violet

$(3)$ Manganate contains $1$ unpaired electron hence it is paramagnetic

where as permanganetic contains no unpaired electrons hence it is diamagnetic.

$(4)$ Both have d's hybridisation hence both have tetrahedral geometry.

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