# NEET Physics Kinetic Theory of Gases Questions Solved

NEET - 2015

Two vessels separately contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B. Under such conditions, the density of A is found to be 1.5 times the density of B. The ratio of molecular weight of A and B is

(a)2/3

(b)3/4

(c)2

(d)1/2

ρA=1.5ρB         ρB
ρA=2ρB            p

According to ideal gas equation, we have Pressure,p=ρRT/M, where M is molecular weight of ideal gas.

Such that,p/ρ=RT/M=>M=ρRT/P

Where,R and T are constants

So, M∝ρ/p

=>MA/MBAx pB/pA

=1.5 x 1/2

=0.75

=3/4

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