Question

Large quantity of $KMn{O}_4$, on treatment with cold conc. $H_{2}S{O}_4$ forms a compound $\left(X\right)$ which decomposed explosively, on heating forming $\left(Y\right)$. The $\left(X\right)$ and $\left(Y\right)$ are ____________ respectively.

• A. $M{n}_2{O}_7,Mn{O}_2$
• B. $M{n}_2{O}_7,M{n}_2{O}_3$
• C. $MnS{O}_4,M{n}_2{O}_3$
• D. $M{n}_2{O}_3,Mn{O}_2$

Answer 1

The correct option is A $M{n}_2{O}_7,Mn{O}_2$

Reaction I:

$2KMn{O}_4+H_{2}S{O}_4\to M{n}_2{O}_7+K_{2}S{O}_4+H_{2}O$

$X$ is $M{n}_2{O}_7$.

Reaction II:
$2M{n}_2{O}_7\underset{}{\overset{\Delta }{\to }}4Mn{O}_2+3O_2$

$Y$ is $Mn{O}_2$.