Manganese dioxide
Hydrogen peroxide
Zinc nitrate
Sodium nitrate
Ammonium nitrate
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The correct answer is **A. Manganese dioxide**.
Here’s why:
- **Manganese dioxide (MnO₂)** does not decompose to give oxygen gas upon heating; it is typically used as a catalyst in other reactions that release oxygen.
- **Hydrogen peroxide (H₂O₂)** decomposes to form water and oxygen.
- **Zinc nitrate (Zn(NO₃)₂)** decomposes to give zinc oxide, nitrogen dioxide, and oxygen.
- **Sodium nitrate (NaNO₃)** decomposes to give sodium nitrite and oxygen.
- **Ammonium nitrate (NH₄NO₃)** decomposes to give nitrous oxide and water, but under certain conditions, it can also decompose to produce nitrogen, oxygen, and water.
the correct option should be A MnO2 does not decompose to give oxygen on heating
The thermal decomposition of aluminum nitrate to produce aluminum oxide, nitrogen dioxide and oxygen. This reaction takes place at a temperature of 150-200°C.
