Arrange the following in order of increasing density:
Oxygen at `25^(@)C`, `1 atm`, Oxygen at `0^(@)C`, `2 atm`, Oxygen at `273^(@)C`, `1 atm`

Explanation

`d prop (1)/(V)`
and `V=(RT)/(P)`
`V` for `O_(2)` at `25^(@)C`, `1 atm`
`=(Rxx298)/(1)=298 R`
`V` for `O_(2)` at `0^(@)C`, `2 atm`
`=(Rxx273)/(2)=136.5R`
`V` for `O_(2)` at `273^(@)C`, `1 atm`
`=(Rxx446)/(2)=446 R`
Hence, the increasing order of density will be `O_(2)` at `273^(@)C`, `1 atm`, `O_(2)` at `25^(@)C`, `1 atm`, `O_(2)` at `0^(@)C`, `2 atm`.