what is the role of manganese dioxide in the preparation of oxygen gas in the laboratory.
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The manganese dioxide is a catalyst. That means it speeds up the decomposition reaction of H2O2 → H2O + O2. Also, being a catalyst,manganese dioxide is not consumed or chemically altered during the reaction. ... a1) Take a photo of your setup while it is producing oxygen.
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it acts as a cAtaylst
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