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Which one is called laughing gas?

A. Ferrous chloride (FeCl2)
B. Sulphur dioxide (SO2)
C. Nitrous oxide (N2O)
D. Ferric hydrogen Fe(OH)3

Answer & Solution
Option: C
Explanation :Nitrous oxide (N2O), also called dinitrogen monoxide, laughing gas, or nitrous, one of several oxides of nitrogen, a colourless gas with pleasant, sweetish odour and taste, which when inhaled produces insensibility to pain preceded by mild hysteria, sometimes laughter.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.
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