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Q.

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

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a

The change in internal energy in the process BC is – 500R

b

The change in internal energy in whole cyclic process is 250 R

c

The change in internal energy in the process CA is 700R

d

The change in internal energy in the process AB is – 350R

answer is A.

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Detailed Solution

Cv = fR/2For diatomic gas, f = 5= -500R
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