February 2019 - Page 3 of 464

A. Initiates a reaction
B. Lowers the activation energy of reacting molecules
C. Is capable of reacting with any one of the reactants
D. Cannot be recovered chemically unchanged at the end of a chemical reaction

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The rate controlling step for the heterogeneous irreversible catalytic reaction A(g) + B(g) → C(g) is the surface reaction of absorbed A with absorbed B to give adsorbed C. The rate expression for this reaction can then be written as (where, KA, KB and KC are the equilibrium constants and is the rate constant of the rate controlling step) ?

A. k KA pApB / (1 + KApA + KBpB)
B. k KAKB pApB / (1 + KApA + KBpB)
C. k KAKB pApB / (1 + KApA + KBpB + KCpC)
D. k KAKB pApB / (1 + KApA + KBpB + KCpC)2

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Reaction rate equation for the bellow figure reaction, If S at is present in large excess, what is the order of this reaction ?

A. Zero
B. One
C. Two
D. Three

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In the gaseous phase ammonia formation reaction (N2 + 3H2 ⇌ 2NH3), the value of the equilibrium constant depends on the_________________?

A. Total pressure of the system
B. Volume of the reactor
C. Temperature
D. Initial concentration of N2 and H2

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Month: February 2019