📝 Multiple Choice Question
General-science
Which of the following elemental gases was discovered by Joseph Priestley in 1774 when he heated mercury oxide?
A
Silver
B
Hydrogen
C
Oxygen
D
Rhodium
Explanation
In an iconic 1774 historical experiment, the English chemist Joseph Priestley isolated oxygen gas by focusing sunlight on mercuric oxide using a magnifying glass. He originally called it 'dephlogisticated air' before Lavoisier later renamed it oxygen.
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