Question

9. Which catalyst is used in the following reactions….

2H₂O₂ → 2H₂O + O₂

• A. MgO₂
• B. CO₂
• C. MnO₂
• D. O₂

Answer 1

The correct option is C

MnO₂

Explanation:

The chemical reaction is as follows:

$\underset{\mathrm{Hydrogen}\mathrm{peroxide}}{2{\mathrm{H}}_2{\mathrm{O}}_2}\underset{\mathrm{Catalyst}}{\overset{{\mathrm{MnO}}_2}{\to }}\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_2}$

Role of manganese dioxide:

• Manganese dioxide does not take part in the chemical reaction. However, it accelerates the rate of decomposition of hydrogen peroxide.
• A substance that does not take part in a chemical reaction but accelerates the rate of reaction is called a catalyst.
• Thus, manganese dioxide acts as a catalyst in the above reaction.

Conclusion: Thus, option (C) is the correct answer.