Question

$KMn{O}_4$ is oxo salt of:

• A. $Mn{O}_2$
• B. $M{n}_2{O}_7$
• C. $Mn{O}_3$
• D. $M{n}_2{O}_3$

Answer 1

The correct option is B $M{n}_2{O}_7$

$M{n}_2{O}_7$ is an acid anhydride of $HMn{O}_4$ and thus $Mn{O}_4^{-}$ is oxo salt of $M{n}_2{O}_7$.

$M{n}_2{O}_7+H_{2}O\to 2HMn{O}_4$,

$2HMn{O}_4+2KOH⟶2KMn{O}_4+2H_{2}O$.

Hence option B is correct.