Which of the following is not a method of preparing oxygen? Options: A . &nbspElectrolysis of water B . &nbspFractional distillation of liquid air C . &nbspDecomposition of potassium permanganate D . &nbspDecomposition of manganese dioxide

Which of the following is not a method of preparing oxygen?

Question

Which of the following is not a method of preparing oxygen?

Options:

A . Electrolysis of water

B . Fractional distillation of liquid air

C . Decomposition of potassium permanganate

D . Decomposition of manganese dioxide

Answer: Option D

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