Multiple choice

$200 ml$ of ${ O }{ 2 }$ gas maintained at $700mm$ pressure and $250 ml$ of ${ N }{ 2 }$ gas maintained at $720mm$ pressure are put together in one-litre flask.If the temperature is kept constant, the final pressure of the mixture in mm is:

  1. $450$
  2. $320$
  3. $632$
  4. $316$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

At constant temperature, each gas contributes pressure equal to its original pressure multiplied by its volume divided by the final volume. The final pressure is 700 x 0.2 + 720 x 0.25 = 320 mm.

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