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–rA is a universal notation for reaction rate. What does the negative sign indicate?(a) Rate of formation of A(b) Rate of disappearance of A(c) Rate of dissociation of A(d) Rate of association of AThis question was addressed to me during an internship interview.This intriguing question comes from Mole Balances topic in chapter Basic Concepts of Chemical Reaction Engineering

Answer»

The correct answer is (B) RATE of disappearance of A

The explanation: rA indicates the rate of FORMATION of A whereas –rA indicates the rate of disappearance of A.



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