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Four moles of electrons were transferred from anode to cathode in an experiment of electrolysis of water.The total volume of two gases produced will be approximately(in litre) at STP.

$\begin{array}{1 1}(a)\;22.4\\(b)\;44.8\\(c)\;67.2\\(d)\;89.4\end{array}$

At Anode : $40H^-\rightarrow 2H_2O+O_2+4e^-$
At cathode : $40H^+4e^-\rightarrow 2H_2$
If number of moles of electron transferred=4
Number of moles of oxygen liberated=1
Number of moles of hydrogen liberated=2
So total moles of gases =3
Volume of gases =$3\times 22.4=67.2litre$
Hence (c) is the correct answer.