A vessel of volume $0.02 \,\,m^3$ contains a mixture of hydrogen and helium at $20\,^oC$ and $2$ atmospheric pressure. The mass of mixture is $5\,\, gms$. Find the ratio of mass of hydrogen to that of helium in the mixture.
  • A$1 : 2$
  • B$1 : 3$
  • C$2 : 3$
  • D$3 : 2$
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