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Three samples of 100 g of water (samples I, II and III), initially kept at 1 atm pressure and 298 K were given the following treatments. 

Sample I was heated to 320 K and cooled to 298 K Sample II was heated to 300 K, cooled to 273 K and heated to 298 K Sample III was heated to 373 K and cooled to 298 K At the end of these processes, the internal energy of

(a) III is the highest 

(b) II is the highest 

(c) I and III are the same, II is lower than that of I and III 

(d) I, II and III are the same

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Correct option (d) I, II and III are the same 


 Internal energy change is a state function.

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