$28\,\, gm$ of $N_2$ gas is contained in a flask at a pressure of $10$ atm and at a temperature of $57^o$. It is found that due to leakage in the flask, the pressure is reduced to half and the temperature reduced to $27\,^oC$. The quantity of $N_2$ gas that leaked out is
  • A$11/20\,\, gm$
  • B$20/11\,\, gm$
  • C$5/63 \,\,gm$
  • D$63/5\,\, gm$
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