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One mole of diatomic ideal gas undergoes a cyclic process ABC as shown in figure . The pr ocess BC is adiabatic . The temperatures at A ,B and C are 400 K , 800 K and 600 K respectively .Choose the correct statement :

(a) The change in internal energy in whole cyclic process is 250 R .\[\](b) The change in internal energy in the process CA is 700 R .\[\](c) The change in internal energy in the process AB is -300 R .\[\](d) The change in internal energy in the process BC is -500 R .

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