Question

________ is used as a catalyst in the preparation of oxygen gas in laboratory.

Answer 1

Preparation of oxygen:

• In the laboratory, Oxygen is prepared from the Hydrogen peroxide which is added drop by drop from a funnel to Manganese dioxide, which is a catalyst in this reaction.
• The chemical reaction can be represented as:

$\underset{\mathrm{Hydrogen}\mathrm{peroxide}}{{\mathrm{H}}_2{\mathrm{O}}_2\left(\mathrm{l}\right)}\stackrel{{\mathrm{MnO}}_2}{\to }\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}$

Therefore, MnO₂ is used as a catalyst in the preparation of oxygen gas in a laboratory.