4 g of an ideal gass (Vapour dencity=20)...

4 g of an ideal gass (Vapour dencity=20) is taken in a bulb of `10 dm^3`volume at a temperature of T K. The bulb is placed in a thermostat maintained at a temperature 125°C more than the initial. To maintain original pressure, 0.8 g of gas has to be removed, then the value of T is

`500 K`

`400 K`

`250 K`

`160 K`

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