A) breathing gas
B) laughing gas
C) exercising gas
D) laboratory gas
Correct Answer: B
Solution :
Nitrous oxide \[({{N}_{2}}O)\] is laughing gas. It is a neutral oxide. It is used as (i) propellent gas (ii) a mixture of \[{{\text{N}}_{\text{2}}}\text{O}\]and\[{{\text{O}}_{2}}\] is used as an aesthetic in dental and other minor surgical operations.
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