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Which gas is called "Laughing gas"?

$\begin{array}{1 1}(A)\;\text{Nitrous oxide}\\(B)\;\text{Methane}\\(C)\;\text{Ozone}\\(D)\;\text{Ethylene}\end{array} $

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Nitrous oxide is called laughing gas
Hence (A) is the correct answer.
answered Apr 11, 2014 by sreemathi.v
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