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Assertion (A): An unsteady state balance is a differential equation rather than an algebraic one.
Reason (R): The accumulation term is the rate of change of the inventory with time.

  • 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 reason for the change of character: a derivative appears, and solving the problem means integrating with an initial condition rather than merely rearranging. The answer is a function of time rather than a number.

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