The ratio of number of molecules in equal weights of H2, He and CH4 is
1 : 1 : 1
1 : 2 : 3
8 : 4 : 1
1 : 2 : 8
H2 : He : CH4
12 : 14 : 116
if number of molecules of H2 are double than that of O2, then ratio of kinetic energy of hydrogen and that of oxygen at 300 K is