AMU Engineering 2019 solved paper Solved Paper

It is wrong because the rate of diffusion of a gas is inversely proportional to the density of the gas at constant pressure.
r∝

1

√d

According to Graham's law the rate of diffusion is inversely proportional to square root of molecular weight and density.
r∝

1

√d

and r∝

1

√M

If one gas has rate of diffusion r1 other gas has rate of diffusion r2, density of gases are d1 and d2, then

r1

r2

=√

d2

d1

or

r1

r2

=√

M2

M1