In 1774, a British clergyman named Joseph Priestley conducted an exper – McqOptions

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1.	In 1774, a British clergyman named Joseph Priestley conducted an experiment in which he focussed sunrays on a tube containing mercuric oxide. This produced a gas which he noticed made candles burn brighter, thus discovering a gas which is the very essence of life. What gas was it?
A.	Carbon dioxide
B.	Nitrogen
C.	Oxygen
D.	Helium
Answer» D. Helium

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