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Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 24 of 557.

Chemical Engineering MCQs

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The rate expression for a heterogeneous catalytic reaction is given by, – rA = K.KA PA(1 + KA.PA + KR.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A)?

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A.E + ΔHA
B.ΔHA + ΔHR
C.E + ΔHA – ΔHR)
D.E
Explanation: The correct answer is E + ΔHA – ΔHR).

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The function of manholes provided in the shell of a distillation column is to ________?

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A.Keep a check on the liquid gradient over the plate by direct visual observation
B.Guard against foaming & entrainment by dumping antifoaming agent through it
C.Give access to the individual trays for cleaning, maintenance and installation
D.All A., B. and C.
Explanation: The correct answer is Give access to the individual trays for cleaning, maintenance and installation.

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