Question

Which of the following statements is not correct regarding $M{n}_3{O}_4$?

• A. It is black in colour and the most stable oxide at high temperature
• B. It has spinel structure
• C. It contains both $Mn(+II)\text{and}Mn(+III),\text{i.e}.,\left(M{n}^{II}M{n}_2^{III}{O}_4\right)$
• D. $O$ atoms are closed packed with $Mn(+III)$ in tetrahedral holes and $Mn(+II)$ in octahedral holes
  

Answer 1

The correct option is D $O$ atoms are closed packed with $Mn(+III)$ in tetrahedral holes and $Mn(+II)$ in octahedral holes


$M{n}_3{O}_4$ is black in colour and the most stable oxide at high temperature. It is formed by heating any oxide or hydroxide of $Mn$ to ${1000}^{\circ }\text{C}$. It contains both $Mn(+II)$ and $Mn(+III)$, i.e.,$\left(M{n}^{II}M{n}_2^{III}{O}_4\right)$ and has a spinel structure. The O atoms are closed packed with Mn(+III) in octahedral holes and Mn(+II) in tetrahedral holes.