Multiple choice

Which of the following methods can be used to produce oxygen in school laboratories?

  1. By heating KClO3 with MnO2

  2. By electrolysis of H2O

  3. By photosynthesis

  4. By decomposition of any oxide

  5. All of the ablove
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A Correct answer
Explanation

Potassium chlorate is a compound containing potassium, chlorine, and oxygen, with the chemical formula KClO3. In pure form, it is a white crystalline substance. It is the most common chlorate in industrial use, and is usually present in well-stocked laboratories. It is used as an oxidizing agent to prepare oxygen as a disinfectant, in safety matches, and in explosives and fireworks. Potassium chlorate ( KCLO3 ) decomposes upon heating to yield potassium chloride and oxygen gas. Manganese dioxide ( MnO2 ) is mixed with potassium chlorate and behaves as a catalyst for this reaction . 2 KClO3 ---( Heat with MnO2 Catalyst )----> 2 KCl + 3 O2.

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