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Assertion (A): The mole and energy balances must be solved together for a non-isothermal reactor.
Reason (R): The rate constant depends on temperature while the temperature depends on the extent of reaction.

  • 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 coupling, which is why non-isothermal problems are almost always solved numerically rather than by hand. Each balance contains the other's variable. The coupling is what makes them hard.

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