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Question

Oxygen can be prepared by heating ___________.
  1. potassium permanganate
  2. methane
  3. none of these
  4. carbon

A
methane
B
carbon
C
none of these
D
potassium permanganate
Solution
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Oxygen can be prepared by heating potassium permanganate. On heating, potassium permanganate splits into potassium manganate and oxygen.
2KMnO4K2MnO4+MnO2+O2

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