A flask contains hydrogen and oxygen in the ratio of $2: 1$ by mass at temperature $27^{\circ} C$. The ratio of average kinetic energy per molecule of hydrogen and oxygen respectively is :
  • A$2: 1$
  • B$1: 1$
  • C$1: 4$
  • D$4: 1$
JEE MAIN 2023, Easy
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