Question

12. How oxygen is prepared from:
(i) mercuric oxide
(i) potassium nitrate ​

Answer 1

Answer:

by heating

we can get oxygen

Answer 2

Joseph Priestley discovered that oxygen was released by heating mercuric oxide, although he did not identify the gas as oxygen (rather, Priestley called it "dephlogisticated air," as that was the paradigm that he was working under at the time).

When Potassium Nitrate Is Heated, Potassium Oxide, Nitrogen, And Oxygen Are Produced

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