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Q.

If an ideal gas at constant temperature and pressure expands, then its

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a

Internal energy remains same

b

Entropy first increases and then decreases

c

Internal energy increases

d

Internal energy decreases 

answer is C.

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Detailed Solution

  • Internal energy at any state is a function of the number of moles n and the temperature. 
  • If the volume expansion takes place at constant temperature and pressure, we see that using the gas equation PV=nRT, we get V ∝ n and thus the number of moles of gas is increasing(maybe the gas is being introduced by an external agent), thus internal energy is increasing.
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