Question

$KMn{O}_4$ on treatment with conc. $H_{2}S{O}_4$ forms a compound (X) which decomposes explosively on heating forming (Y). The (X) and (Y) are respectively :

• A. $M{n}_2{O}_7,Mn{O}_2$
• B. $M{n}_{2}O,M{n}_2{O}_3$
• C. $MnS{O}_4,M{n}_2{O}_3$
• D. $M{n}_2{O}_3,Mn{O}_2$

Answer 1

Answer: (A)

$M{n}_2{O}_7,Mn{O}_2$

$KMn{O}_4$ on treatement with conc. $H_{2}S{O}_4$ gives following reaction.

$KMn{O}_4+H_{2}S{O}_4\to H_{2}O+K_{2}S{O}_4+M{n}_2{O}_7\left(X\right)$

X on heating gives following product. .

$M{n}_2{O}_7\left(X\right)\stackrel{Heat}{\to }Mn{O}_2\left(Y\right)$