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Q.

An insulated container is divided into two equal portions. One portion contains an ideal gas at pressure and temperature. The other portion is a perfect vacuum. If a hole is opened between two portions, Then

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a

Temperature remains constant

b

Internal energy changes high to low

c

Temperature change low to high

d

Internal energy remains same

answer is A, B.

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Detailed Solution

The system being thermally insulated and thus Q=0

The gas expands through hole in other portion to show free expansion, i.e., W=0

(Since. P=0 )
Also from I law of thermodynamics
Since, Q=U+W

Q=0,W=0, Since, 3 . U=0 and thus temperature will also remain constant.

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