Chemical Engineering Mcqs

An endothermic aqueous phase first order irreversible reaction is carried out in an adiabatic plug flow reactor. The rate of reaction ?

(A) Is maximum at the inlet of the reactor
(B) Goes through a maximum along the length of the reactor
(C) Goes through a minimum along the length of the reactor
(D) Is maximum at the exit of the reactor

Submitted By :Ali Uppal

Pick out the wrong statement ?

(A) In a multistep reaction, the slowest step is the rate determining step
(B) In general, the rate of a reaction becomes triple for every 10°C rise in temperature
(C) Slow chemical reactions have generally high values of activation energy
(D) Molecularity of a reaction cannot be zero but the order of a reaction can be zero

Submitted By :Ali Uppal

The performance of a cascade of CSTR’s can be improved by adding__________________?

(A) A P.F. reactor in series
(B) A P.F. reactor in parallel
(C) More CSTR’s in series
(D) More CSTR’s in parallel

Submitted By :Ali Uppal

According to Arrhenius equation of temperature dependency of rate constant for an elementary reaction _________________?

(A) k ∝ √T
(B) k ∝ e-E/RT
(C) k ∝ T e-E/RT
(D) None of these

Submitted By :Ali Uppal

When the reaction is dominated by intraparticle diffusion, the apparent order of reaction (nD) as measured is related to the true order (n) as ________________?

(A) nD = (n + 1)/2
(B) nD = n/2
(C) n
(D) = n + 1

Submitted By :Ali Uppal

The equilibrium constant for the reversible reaction as shown in the bellow figure, is affected by the__________________?

(A) Temperature of the system
(B) Presence or absence of inerts
(C) Pressure of the system
(D) Kinetics of the reaction

Submitted By :Ali Uppal

. In the converter of the contact process for the manufacture of H2SO4 the equilibrium conversion of SO2__________ (i) __________ with increase in temperature and __________ (ii) __________ with increase in the mole ratio of SO2 to air?

(A) (i) increases (ii) decreases
(B) (i) decreases (ii) increases
(C) (i) increases (ii) increases
(D) (i) decreases (ii) decreases

Submitted By :Ali Uppal

Consider the ‘n’ th order irreversible liquid phase reaction A → B. Which one of the following plots involving half life of the reaction (t1/2) and the initial reactant concentration (CA0) gives a straight line plot ?

(A) CA0 Vs t1/2
(B) ln CA0 Vs t1/2
(C) CA0 Vs ln t1/2
(D) ln CA0 Vs ln t1/2

Submitted By :Ali Uppal

In a reaction, the threshold energy is equal to (where, A = activation energy N = normal energy of reactants) ?

(A) A
(B) N
(C) A + N
(D) A – N

Submitted By :Ali Uppal

A trickle bed reactor is the one, which_________________?

(A) Has altogether three streams either entering or leaving
(B) Processes three reactants at different flow rates
(C) Processes three reactants with same flow rate
(D) Employs all the three phases (i.
(E) solid, liquid and gas)

Submitted By :Ali Uppal

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