Question

A powdered mixture of $KCl{O}_3$ is heated in presence of $Mn{O}_2$ to prepare oxygen in the laboratory because:

• A. this gives pure oxygen
• B. $Mn{O}_2$ liberates oxygen in presence of $KCl{O}_3$
• C. it is cheaply obtained
• D. oxygen is liberated at lower temperature

Answer 1

Answer: (D)

oxygen is liberated at lower temperature

A powdered mixture of $KCl{O}_3$ is heated in presence of $Mn{O}_2$ to prepare oxygen in the laboratory because oxygen is liberated at lower temperature.
$2KCl{O}_3\underset{{400}^{o}C}{\overset{Mn{O}_2}{\to }}2KCl+3O_2\uparrow$