NEET UG CHEMISTRY MCQ: STATES OF MATTER

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Application +4 | -1

The rms velocity of molecules of a gas of density

4\,\,kg\,\,{m^{ - 3}}

and pressure 

1.2 \times {10^5}N{m^{ - 2}} is

View answer and explanation

Correct option: A

300\,\,\mathrm{m}{\mathrm{s}^{ - 1}}

Option A (

300\,\,\mathrm{m}{\mathrm{s}^{ - 1}}

) is correct because the RMS velocity can be calculated directly from the pressure and density using the formula

v_{rms} = \sqrt{\frac{{3P}}{\rho}}

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\begin{array}{cccccccccccccccccccc} {\underline {{\text{Gas}}} }&{\underline {\,{\text{Critical}}\,\,{\text{temperature}}} } \\ {\text{A}}&{{T_{{C_1}}}} \\ {\text{B}}&{{T_{{C_2}}}} \\ {\text{C}}&{{T_{{C_3}}}} \\ {\text{D}}&{{T_{{C_4}}}} \end{array}

{T_{{C_1}}} > {T_{{C_2}}} > {T_{{C_3}}} > {T_{{C_4}}}

{r^x}

r

x