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Question

The internal energy of an ideal gas decreases by the same amount as the work done by the system.

A
The process must be adiabatic.
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B
The process must be isobaric.
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C
The temperature must decrease.
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D
The process must be isothermal.
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Solution

The correct options are
A The temperature must decrease.
D The process must be adiabatic.
The internal energy of an ideal gas decreases by the same amount as the work done by the system.

Change in internal energy=work done+heat exchange
change in internal energy=work done if process has no heat exchange, i.e. it's adiabatic and the temperature must decrease

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