Question

a which of the
flowing substance is used
in preparation of oxygen
in the laboratory ?
A. Potassium permanganate
B. Potassium chloride
C.Ammonium chloride
D.Copper sulphate.​

Answer 1

Answer:

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Answer 2

Sorry mate,

But question's answer is given the option.

I know the answer is

Hydrogen Peroxide and Magnesium Dioxide.

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