Question

10.State the use of manganese dioxide in the laboratory preparation of oxygen from potassium chlorate?

Answer 1

Manganese dioxide acts as a catalyst.

• Role of catalyst:- Catalyst is used to alter (increases or decreases) the rate of reaction without change in the concentration of catalyst itself.

Uses of manganese dioxide

• In the laboratory preparation of oxygen (O₂) from potassium chlorate (KClO₃) , manganese dioxide (MnO₂) is used as a catalyst .
• Manganese dioxide is used as a catalyst as it increases the rate of manufacturing of oxygen without change in its concentration.
• $\underset{\mathrm{potassium}\mathrm{chlorate}}{2{\mathrm{KClO}}_3}\stackrel{{\mathrm{MnO}}_2}{\to }\underset{\mathrm{Potassium}\mathrm{chloride}}{2\mathrm{KCl}}+\underset{\mathrm{Oxygen}}{3{\mathrm{O}}_2}$