Multiple choice

Oxygen was discovered by _______.

  1. Sir Humphry Davy in 1807

  2. Joseph Priestly in 1774

  3. Andreas Marggrat in 1746

  4. Bernard Courtois in 1811
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Joseph Priestley is widely credited with the discovery of oxygen in 1774, when he isolated it by heating mercuric oxide.

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