Question

B. Statements given below are incorrect. Write the correct statements :

1. Oxygen is prepared in laboratory by treating hydrogen oxide with manganese dioxide.

Answer 1

Corrected statement: Oxygen is prepared in the laboratory by treating hydrogen peroxide with manganese dioxide as a catalyst.

• A substance which when used in small amounts in reactions modifies the rate of a reaction without being consumed in the reaction itself is known as a catalyst
• The given reaction is:
• $\underset{}{\underset{\mathrm{Hydrogen}\mathrm{peroxide}}{2{\mathrm{H}}_2{\mathrm{O}}_2\left(\mathrm{l}\right)}\underset{\mathrm{Catalyst}}{\overset{{\mathrm{MnO}}_2}{\to }}\underset{\mathrm{Water}}{2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}}$