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Assertion (A): Departure or residual functions are used for real fluids.
Reason (R): They express the difference between the real property and the ideal gas value at the same temperature and pressure.

  • A.A is true but R is false
  • B.A is false but R is true
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A

Answer: C

Both are true and the reason gives the construction: the ideal gas part is easy from heat capacity data, so isolating the departure lets an equation of state supply only the correction needed. Heat capacity data and an equation of state together suffice.

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