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12 . kinetic theory of gases — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics12 . kinetic theory of gases1 Mark
MCQ
When air is filled in the balloon, the pressure and volume both increases while temperature does not change. Here Boyle's law is not obeyed because
  • A
    Mass of air is negligible
  • ✓
    Mass of air does not remain constant
  • C
    Air is not perfect gas
  • D
    Pressure inside the balloon is less than that of the atmospheric pressure
✓

Answer

Correct option: B.
Mass of air does not remain constant
b
No, because the mols of air and also changing in this case as you blow into the balloon

we have,

$P V=n R T .$

Let the tempenatune stays constant when you blow in to a balloon, if $P$ increases by scale facton of $x$ and $V$ increases by scale facton of $x$, then the number of mols would have to increse by Scale facton of $x^{2}$.

$\frac{P V}{n}=R T .$

To express this realtionship:

$\frac{P_{1} V_{1}}{n_{1}}=\frac{P_{2} V_{2}}{n_{2}} .$

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