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Standard XII

Chemistry

Dalton's Law of Partial Pressures

The pressure ...

Question

The pressure of moist gas at a given temperature is 10 mm Hg at volume $V$ . Aqueous tension at this temperature is 3 mm Hg point the final pressure of gas at the same temperature if the volume is reduced to 1/3 original volume is:

30mm Hg

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27mm Hg

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24mm Hg

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21mm Hg

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Solution

The correct option is B 24mm Hg
The moist gas has pressure $= 10 m m H g$ , and aqueous tension $= 3 m m H g$

$\Rightarrow$ Pressure of dry gas $= 10 - 3 = 7 m m H g$

Now, volime $V$ is reduced to $\frac{V}{3} .$

SH constant $T$ (Isothermai process):

$P_{1} V_{1} = P_{2} V_{2}$

$\Rightarrow 7 \times V = P_{1} . \frac{V}{3}$

$\Rightarrow P_{2} = 21 m m H g .$ (paratial pressure of dry gas)

As it exists in moist form, final pressure $= 21 + 3 = 24 m m H g$
(aqueous tension adds up )

Hence, the correct option is $C$

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The pressure of moist gas at a given temperature is 10 mm Hg at volume V. Aqueous tension at this temperature is 3 mm Hg point the final pressure of gas at the same temperature if the volume is reduced to 1/3 original volume is:

The pressure of moist gas at a given temperature is 10 mm Hg at volume $V$ . Aqueous tension at this temperature is 3 mm Hg point the final pressure of gas at the same temperature if the volume is reduced to 1/3 original volume is: