Chemical Engineering Mcqs

With increase in the order of reaction (for all positive reaction orders), the ratio of the volume of mixed reactor to the volume of plug flow reactor (for identical feed composition, flow rate and conversion)?

(A) Increases
(B) Decreases
(C) Remain same
(D) Increases linearly

Submitted By :Ali Uppal

The rate of the heterogeneous catalytic reaction A(g) + B(g) → C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction is_______________?

(A) Absorption of A
(B) Surface reaction between absorbed A and absorbed B
(C) Surface reaction between absorbed A and B in the gas phase
(D) Surface reaction between A in the gas phase and absorbed B

Submitted By :Ali Uppal

The rate equation for the reaction represented by as shown in the bellow figure, is given by – rx = K1 . Cx/(1 + K2 Cx). At high value of Cx (i.e.., K2Cx > > 1), the order of the reaction and the rate constant are respectively___________________?

(A) Zero order & K1/K2
(B) Zero order & K1
(C) First order & K1
(D) First order & K1/K2

Submitted By :Ali Uppal

The temperature dependence of reaction rate constant (K) by Arrhenius law is given by_______________?

(A) K α e-E/RT
(B) K α eE/RT
(C) K α T . e-E/RT
(D) K α √T . e-E/RT

Submitted By :Ali Uppal

In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for________________?

(A) Fast reactions in catalyst of small pore diameter
(B) Fast reaction in catalyst of large pore diameter
(C) Slow reactions in catalyst of small pore diameter
(D) Slow reactions in catalyst of large pore diameter

Submitted By :Ali Uppal

Half-life period for a first order reaction is _____________ the initial concentration of the reactant?

(A) Directly proportional to
(B) Inversely proportional to
(C) Independent of
(D) None of these

Submitted By :Ali Uppal

Recycling back of outlet stream to the reactor from an ideal CSTR carrying out a first order liquid phase reaction will result in ______________ in conversion?

(A) Decrease
(B) Increase
(C) No change
(D) Either

Submitted By :Ali Uppal

In case of a _____________ reactor, the composition in the reactor and at the exit of the reactor is the same ?

(A) Semi-batch
(B) Tubular
(C) Batch
(D) Back-mix

Submitted By :Ali Uppal

Catalytic action in a catalytic chemical reaction follows from the ability of catalyst to change the ___________________?

(A) Activation energy
(B) Equilibrium constant
(C) Heat of reaction
(D) None of these

Submitted By :Ali Uppal

Reaction of benzene with chlorine gas to produce tri-chlorobenzene exemplifies a/an ______________ reaction?

(A) Elementary
(B) Parallel
(C) Consecutive
(D) None of these

Submitted By :Ali Uppal

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