JEE Main 2013 Chemistry question

Which of the following statements/relationships is not correct in thermodynamic changes ?

(1)ΔU = 0 (isothermal reversible expansion of a gas)
(2) (isothermal reversible expansion of an ideal gas)
(3) (isothermal reversible expansion of an ideal gas)Correct
(4)For a system of constant volume heat involved directly changes to internal energy.

Answer: (3)

Solution

With w as work done on the system (IUPAC convention), isothermal reversible expansion gives , so (2) is

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Question ID VK-104111