Consider the following processes (Treat all gases as ideal).
1. Nitrogen gas is compressed isothermally to one half its original volume.
2. Carbon dioxide is allowed to expand isothermally to 10 times its original volume.
3. A glass of water loses 100 J of energy reversibly at 30°C.
4. The temperature of one mole of helium is increased 25°C at constant pressure.
5. The pressure of one mole of oxygen gas is allowed to double isothermally.
Which of these processes leads to an increase in entropy?
a) 1 and 4 b) 5 c) 3 and 5 d) 2 and 4 e) 1 and 2
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