SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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J. Priestly
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J. Black
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Ibn e sina
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You
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Detailed explanation-1: -Joseph Priestley (1733-1804)-Unitarian minister, teacher, author, and natural philosopher-was the Earl of Shelburne’s librarian and tutor to his sons. In this room, then a working laboratory, Priestley pursued his investigations of gases. On 1 August 1774 he discovered oxygen.
Detailed explanation-2: -Priestley was one of the first scientists who discovered oxygen. In 1774, he prepared oxygen by heating mercury oxide with a burning glass. He found that oxygen did not dissolve in water and it made combustion stronger. Priestley was a firm believer of phlogiston theory.
Detailed explanation-3: -Joseph Priestley (1733–1804) was the first person to report the discovery of oxygen and describe some of its extraordinary properties. As such he merits a special place in the history of respiratory physiology.