A) \[2.5\]
B) \[3\]
C) \[5\]
D) \[7.5\]
Correct Answer: B
Solution :
\[\underset{\begin{smallmatrix} 2\,\,mole \\ \,\,\,\,2\times 18 \\ =36\,\,g \end{smallmatrix}}{\mathop{2{{H}_{2}}O}}\,\xrightarrow{Electrolysis}2{{H}_{2}}+\underset{1\,\,mole}{\mathop{{{O}_{2}}}}\,\] \[\because \]\[36\,\,g\]of \[{{H}_{2}}O\] produce \[1\] mole of oxygen. \[\therefore \]\[108\,\,g\]of water will produce oxygen. \[=\frac{108}{36}=3\,\,mol\]
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