GENERAL KNOWLEDGE

Detailed explanation-1: -Lavoisier proved that air contained a new element, oxygen, which combined with hydrogen to make water. He disproved the phlogiston theory but Priestley called it dephlogisticated air until his death 30 years later.

Detailed explanation-2: -Among them was the colorless and highly reactive gas he called “dephlogisticated air, ‘’ to which the great French chemist Antoine Lavoisier would soon give the name “oxygen."

Detailed explanation-3: -Northumberland, Pennsylvania, U.S. Priestley is credited with his independent discovery of oxygen by the thermal decomposition of mercuric oxide, having isolated it in 1774.

Detailed explanation-4: -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.