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During which year, Joseph Priestley discovered O2?

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in Biology – Class 11 by (272k points)
During which year, Joseph Priestley discovered O2?

(a) 1774

(b) 1770

(c) 1884

(d) 1880

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I would like to ask this question from Photosynthesis Basics topic in portion Photosynthesis in Higher Plants of Biology – Class 11

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Right option is (a) 1774

To elaborate: Joseph Priestley discovered O2 in 1774. He found the presence of oxygen during his experiment. In a jar containing a mouse, a candle and a mint plant, he found out that the mouse was alive and the candle was lit up. This showed that the mint plant gave oxygen to the enclosed jar.

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