Assuming ideal gas behaviour, the ratio of density of ammonia to that of hydrogen chloride at same temperature and pressure is : (Atomic wt. of Cl = 35.5 u)

Options

A. 1.46
B. 1.64
C. 0.46
D. 0.64

Answer

C

Explanation

From ideal gas equation -
PV = nRT, wheren = m/M
So, PV = mRT/M, P= mRT/MV
P=dRT/M
At constant temperature and pressure, `d prop M`
`d_(1)//d_(2)=M_(1)//M_(2)`
(Here `d_(1)` and `M_(1)` are density and molecular mass of ammonia and `d_(2)` and `M_(2)` are density and molecular mass of hydrogen chloride)
`d_(1)//d_(2)=17//36.5,d_(1)//d_(2)=0.46`