The molecular weights of $O_2$ and $N_2$ are $32$ and $28$ respectively. At $15°C,$ the pressure of $1 \,gm$ $O_2$ will be the same as that of $1 \,gm$ $N_2$ in the same bottle at the temperature ...... $^oC$
  • A$-13$
  • B$21$
  • C$15$
  • D$56.4$
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