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Question
Which of the following equations is obtained on combining 1st and 2nd law of thermodynamics, for a system of constant mass?
Options:
A .  DQ = CvdT + PdV
B .  Tds = dE - PdV
C .  DE = Tds - PdV
D .  DQ = CpdT + Vdp
Answer: Option C

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