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Which of the following gas is lightest

$\begin{array}{1 1}(a)\;\text{Dihydrogen}\\(b)\;\text{Helium}\\(c)\;\text{Dinitrogen}\\(d)\;\text{Dioxygen}\end{array}$

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1 Answer

Molecular weight of hydrogen is less.
Hence (a) is the correct answer.
answered Jan 22, 2014 by sreemathi.v
 
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