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Standard XII

Chemistry

Identification of Different Process

Two cylinders...

Question

Two cylinders $P$ and $Q$ of equal capacity are connected to each other via a stopcock. Cylinder $P$ contains an ideal gas at standard temperature and pressure. Cylinder $Q$ is completely evacuated. The entire system is thermally insulated, stopcock is suddenly opened. What is the effect on internal energy of gas ?

Increases

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Decreases

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No change

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May increase or decrease

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Solution

The correct option is C No change
The process is adiabatic free expansion. Hence
$Δ Q = 0, Δ T = 0$
$\Rightarrow Δ U = 0$

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The correct option is C No changeThe process is adiabatic free expansion. Hence ΔQ=0,ΔT=0 ⇒ΔU=0

The correct option is C No change
The process is adiabatic free expansion. Hence
$Δ Q = 0, Δ T = 0$
$\Rightarrow Δ U = 0$