Question

The catalyst used in the preparation of oxygen gas in laboratory is

• A. H₂O₂
• B. MnO₂
• C. KNO₃
• D. KClO₃

Answer 1

The correct option is B

MnO₂

The explanation for the correct option-

Option (B)

MnO₂ is used as a catalyst to produce oxygen from hydrogen peroxide.

$$\begin{gathered} 2{\mathrm{H}}_2{\mathrm{O}}_2\left(\mathrm{l}\right)\stackrel{{\mathrm{MnO}}_2}{\to }2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right) \\ (\mathrm{Hydrogen}(\mathrm{Water})(\mathrm{Oxygen}\left) \\ \mathrm{peroxide}\right) \end{gathered}$$

The explanation for the incorrect options-

(B) H₂O₂ - Hydrogen peroxide (H₂O₂) is used in the laboratory to produce oxygen gas

(C) KNO₃ - It also produces oxygen gas when heated.

(D) KClO₃ - It also produces oxygen gas when heated.

The options (C) potassium nitrate(KNO₃) and (D) potassium chlorate(KClO₃) produce oxygen gas but generally, they are not used to produce oxygen in a laboratory.

Hence, option (B) is correct. MnO₂ is used as a catalyst in the production of oxygen gas in the laboratory.