38. The molecular weights of

O₂ and N₂ are 32 and 28 respectively. At 15°C, the pressure of 1 gm O₂ will be the same as that of 1 gm N₂ in the same bottle at the temperature

(a) – 21°C                             (b) 13°C

(c) 15°C                                (d) 56.4°C

Answer-a