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Assertion (A): A gamma-phi approach is preferred for aqueous or alcoholic systems at low pressure.
Reason (R): A cubic equation of state describes strongly hydrogen bonded liquids poorly.

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

Answer: B

Both are true and the reason gives the motivation: the liquid phase is where the difficulty lies, so an activity coefficient model fitted to real data is used there while the vapour is handled by a simple equation of state.

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