Q139 / 160 · AP EAMCET 2015 · Physics

A flask contains argon and chlorine in the ratio of $2: 1$ by mass. The temperature of the mixture is $27^{\circ} \mathrm{C}$. The ratio of average kinetic energies of two gases per molecule is

  • Correct answer
    A
    $1:1$
  • B
    $2:1$
  • C
    $3:1$
  • D
    $6:1$

Solution

(a) The average kinetic energy of molecules is given by $\mathrm{KE}_{\mathrm{av}}=\frac{3}{2} K T$. So it depends only on temperature $\mathrm{KE}_1: \mathrm{KE}_2=1: 1$

Hence, the correct answer is option: 'A'.

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