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The rate of decomposition of hydrogen peroxide (H$_2$O$_2$ $\longrightarrow$ H$_2$O + O$_2$), which is slow at room temperature, can be increased by adding:
Amanganese dioxide (MnO$_2$)
Bsodium chloride (NaCl)
Ccalcium carbonate (CaCO$_3$)
Dpotassium nitrate (KNO$_3$)
Answer & Solution
Correct answer: A. manganese dioxide (MnO$_2$)
1. Hydrogen peroxide decomposes slowly into water and oxygen at room temperature.
2. Adding manganese dioxide (MnO$_2$) powder speeds up the reaction; MnO$_2$ acts as a catalyst.
3. MnO$_2$ increases the rate without itself undergoing chemical change.
4. NaCl, CaCO$_3$ and KNO$_3$ are not catalysts for this decomposition, so those options are wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.50_
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