1. Tardigrade
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  3. Chemistry
  4. Nitrous oxide is known as :

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Q. Nitrous oxide is known as :

AFMCAFMC 2004

Solution:

Nitrous oxide $\left( N _{2} O \right)$ is laughing gas. It is a neutral oxide. It is used as
(i) propellent gas
(ii) a mixture of $N _{2} O$ and $O _{2}$ is used as anaesthetic in dental and other minor surgical operations.