[Answer] Which one of the following gases was used as an early anesthetic?

Step 1 : Introduction to the question " Which one of the following gases was used as an early anesthetic? "

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Nitrous oxide was discovered by the English chemist Joseph Priestley in 1772; another English chemist, Humphry Davy, later named it and showed its physiological effect. A principal use of nitrous oxide is as an anesthetic in surgical operations of short duration; prolonged inhalation causes death.

Nitrous oxide (N2O), also called dinitrogen monoxide, laughing gas, or nitrous, is one of several oxides of nitrogen, a colorless gas with pleasant, sweetish odor and taste, which when inhaled produces insensibility to pain preceded by mild hysteria, sometimes laughter. (Because inhalation of small amounts provides a brief euphoric effect and nitrous oxide is not illegal to possess, the substance has been used as a recreational drug.)

More Info: www.ncbi.nlm.nih.gov

Step 2 : Answer to the question " Which one of the following gases was used as an early anesthetic? "

Carbon dioxide:

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