A flask contains Argon and Chlorine in the ratio of 2 : 1 by mass. The temperature of the mixture is 27°C. The ratio of root mean square speed of molecules of two gases will be: (atomic mass of Argon = 40 u and molecular mass of Chlorine = 71 u)

1.33

The correct answer is Option (2) → 1.33

The ratio of the rms speed of argon (Ar) and Chlorine (Cl) is -

$\frac{V_{rms},Ar}{V_{rms},Cl_2}=\sqrt{\frac{m_{Cl_2}}{m_{Ar}}}$

$=\sqrt{\frac{71}{40}}$

$≃1.33$