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Question

Explain the laboratory preparation of oxygen with hydrogen peroxide (H​​​​​​2​​​​​O​​​​2) and manganese dioxide (MnO​​​​2).

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Solution

Manganese dioxide catalyzes the decomposition of hydrogen peroxide.
Hydrogen peroxide(H2O2), decomposes naturally at a very slow rate to form oxygen gas and water. When manganese dioxide(MnO2), is added to a solution of hydrogen peroxide, the rate of the reaction increases significantly. Manganese dioxide acts as a catalyst for the decomposition of hydrogen peroxide, meaning that it is not consumed in the reaction.
The balanced chemical equation for this reaction:
H2O2Δ,MnO2−−−−−−2H2O+O2


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