Question

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
• C. Manganate and permanganate ions are paramagnetic
• D. Manganate and permanganate ions are tetrahedral

Answer 1

Answer: (C)

Option 1 ) Manganate $\Rightarrow Mn{O}_4^{2-}$,

Permanganate $\Rightarrow Mn{O}_4^{-}$



After excitation



$2\times 2p_{\pi }-3d_{\pi \sigma }$



$2\times 2P_{\pi }-3d_{\pi }$

$1\times 2P_{\pi }-4P_{\pi }$

(2) $Mn{O}_4^{2-}\Rightarrow$ green

$Mn{O}_4\Rightarrow$ 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 $d^{3}s$ hybridisation hence both have tetrahedral geometry