Chemical Reaction MCQs

188 MCQs — Chemical Engineering MCQs (Page 13 of 19)

Attempt Chemical Reaction Quiz

Given, 3H2 + CO = CH4 + H2O, KP = 101.84 and, 4H2 + CO2 = CH4 + 2H2O, KP = 101.17 the KP for the reaction CO + H2O = CO2 + H2 is __________________?

A. 103.01
B. 10-0.67
C. 10-3.01
D. 100.67

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The sequence in which three CSTR’s of volumes 5, 10 and 15 m3 will be connected in series to obtain the maximum production in a second order irreversible reaction is ____________________?

A. 15, 10, 5
B. 5, 10, 15
C. 10, 5, 15
D. 10, 15, 5

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Decomposition rate of a liquid ‘X’ which decomposes as per the reaction as shown in the bellow figure is given by________________?

A. K1 . cx
B. (k1 + k2 + k3) cx
C. (k1 + k2) cx
D. (k2 + k3) cx

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A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by________________?

A. Keff = k + kg
B. Keff = (k+ kg)/2
C. Keff = (kkg)1/2
D. 1/keff = 1/k + 1/kg

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For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the _______________ is the controlling resistance?

A. Film diffusion
B. Diffusion through ash layer
C. Chemical reaction
D. Either a., b. or c.

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A chemical reaction occurs when the energy of the reacting molecules is __________________ the activation energy of the reaction?

A. Less than
B. Equal to
C. More than
D. Equal to or more than

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Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A → 3B. Mole fraction of A in the exit stream is______________________?

A. 1/2
B. 1/3
C. 1/4
D. 1/5

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A second order reaction of the form A + B → C is called a pseudo-first order reaction, when____________________?

A. Ca0 = cb0
B. Ca0 > cb0
C. Cb0 > ca0
D. Cb0 ≥ cb0

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What is the maximum possible value of FR(mole/sec.) ?

A. 1/3
B. 1/2
C. 2/3
D. 2

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Concentration of the limiting reactant (with initial concentration of a moles/litre) after time t is (a-x). Then ‘t’ for a first order reaction is given by____________________?

A. K. t = ln a/(a – x)
B. K. t = x/a (a – x)
C. K. t = ln (a – x)/a
D. K. t = ln a (a – x)/x

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