Two vessels separately contain two ideal gases A and B at the same temperature, the pressure of A being…

Two vessels separately contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B. Under such conditions, the density of A is found to be 1.5 times the density of B. The ratio of molecular weights of A and B is
  1. 34
  2. 2
  3. 12
  4. 23

Solution

PA= ρARTMA, PB= ρBRTMB

⇒ PAPB= ρAρB MBMA

⇒32MBMA=2
So, MAMB =34

Asked in: NEET 2015 (Phase 2)

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