The correct option is A 16:7
The mathematical form of the Ideal Gas Law is:
PV = nRT and n = m/MW
Where:P - pressure
V - volume
n - number of moles
T - temperature
m - mass
MW - Molecular Weight
R - ideal gas constant
So we can write,
PaPb =Mb×VbMa×Va
here, Vb=2VaandMa = atomic wt of O2 = 8 and Mb = atomic wt of N2 = 7
Putting these values we get,
Pa/Pb = 16/7