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Question

An ideal gas undergoes adiabatic expansion against external pressure. Which of the following are correct ?


A
Internal energy of the gas remains unchanged
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B
Internal energy of the gas decrease
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C
Temperature of the system decreases
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D
ΔE+PΔV=0
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Solution

The correct options are
B Internal energy of the gas decrease
C Temperature of the system decreases
D ΔE+PΔV=0
For adiabatic process, q = 0.
Hence ΔE=W=PΔV
Also, ΔE=CvΔT=PΔV
Since ΔV is positive for expansion, ΔE will be negative and so also ΔT

Chemistry

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