Q. Which among the following is called Laughing Gas popularly?
Answer: Nitrous oxide
Notes:

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.

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