Chemistryeasy · Past Paper
Which of the following substances is used as a catalyst in the laboratory preparation of oxygen from potassium chlorate?
AIron filings
BManganese dioxide
CCopper sulfate
DSodium chloride
✓ Correct Answer: B — Manganese dioxide
Manganese dioxide (MnO2) acts as a positive catalyst to increase the rate of decomposition of potassium chlorate at a lower temperature.
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