Select correct statement :

Engineering

Chemistry

Entropy Calculations

Question

During adiabatic expansion of an ideal gas temperature of gas will increase.

for reversible process ΔS_surrounding must be zero.

Entropy of universe can be created but not destroyed.

ΔS_system is always zero for reversible process.

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Let's analyze each statement:

First statement is false. In adiabatic expansion (Q=0), gas does work (W<0), so internal energy decreases (ΔU<0). For ideal gas, this means temperature decreases.

Second statement is false. For a reversible process, ΔS_universe = 0, but ΔS_surroundings = -ΔS_system, which is not necessarily zero.

Third statement is false. Entropy of the universe can only be created (ΔS_univ ≥ 0 for any process), never destroyed.

Fourth statement is false. ΔS_system is not necessarily zero for reversible processes; it depends on the specific process path.

Final Answer: None of these statements are correct.