In 1774 Joseph Priestley heated red mercuric oxide and obtained a mysterious gas that enabled a candle to continue burning. What was this gas?

In 1774 Joseph Priestley heated red mercuric oxide and obtained a mysterious gas that enabled a candle to continue burning. What was this gas? Correct Answer oxygen

Joseph Priestley’s lasting reputation in science is founded upon the discovery he made on August 1, 1774, when he obtained a colourless gas by heating red mercuric oxide. This gas, which enabled a candle to burn, was oxygen.
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