Question

IF 36ml of water is electrolysed what will be the volume of hydrogen and oxygen at STP.

Answer 1

since H2O=2H+ 1/2 O2
so 1 mole of h2o forms 2 mol h and 1/2 mol O
hence 36ml H2O= 2mol 
and 2mol h2o forms 1 mol O and 4 mole H
so 16ml O and 4 ml H