Question

$KMn{O}_4$ reacts with $H_2{O}_2$ in an acidic medium. The number of moles of oxygen produced per mole of $KMn{O}_4$ is?

• A. $2.5$
• B. $5$
• C. $1.25$
• D. $2$

Answer 1

Answer: (A)

$2.5$

The overall chemical reaction can be written as:

$2KMn{O}_4+5H_2{O}_2+3H_{2}S{O}_4\to 5O_2+2MnS{O}_4+K_{2}S{O}_4+8H_{2}O$

If we divide throughout by 2, the number of moles of Oxygen produced per mole of $KMn{O}_4$ will be 2.5.