chemical engineering chemical reaction MCQs – Page 23

Practise multiple-choice questions from chemical engineering chemical reaction for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical reaction Mcqs

441. A gaseous reactant is introduced in a mixed reactor of 3 litres volume at the rate of 1 litre/second. The space time is ______________ seconds?
0

A. 1

B. 32

C. 3

D. 3-Jan

442. Radioactive decay follows ______________ order kinetics?
0

A. Zero

B. Third

C. Second

D. First

443. The eddy diffusivity for a liquid in plug flow must be_________________?
0

A. ?

B. 0

C. 1

D. Between 0 and 1

444. Reaction rate equation for the bellow figure reaction, If S at is present in large excess, what is the order of this reaction ?
0

A. Zero

B. Three

C. Two

D. One

445. The catalytic activity of enzymes is due to their capacity to lower the ______________ energy?
0

A. Potential

B. Kinetic

C. None of these

D. Activation

446. ______________ is the response curve for a step input signal from a reactor ?
0

A. C-curve

B. S-curve

C. None of these

D. I-curve

447. An autothermal reactor is_________________?
0

A. Most suitable for a second order reaction

B. Isothermal in nature

C. Completely self-supporting in its thermal energy requirements

D. Most suitable for a reversible reaction

448. For an isothermal second order aqueous phase reaction, A ? B, the ratio of the time required for 90% conversion to the time required for 45% conversion is____________________?
0

A. 22

B. 2

C. 11

D. 4

449. The half life period of a first order reaction is given by (where, K = rate constant) ?
0

A. 6.93 K

B. 1.5 K

C. 2.5 K

D. 0.693/K

450. A multiple reaction may be classified as a ________________ reaction?
0

A. Consecutive or side

B. Mixed

C. All A., B. and C.

D. Parallel or side

451. Pick out the correct statement ?
0

A. Law of mass action was suggested by Le-Chatelier

B. A catalyst changes the equilibrium point

C. rgy

D. The difference between the energy of reactants and that of the products is the activation

E. A catalyst does not change AH of the reaction

452. At a given temperature, K1, K2 and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively. CH4(g) + H2O(g) ? CO(g) + 3H2(g), CO(g) + H2O(g) ? CO2(g) + H2(g) CH4(g) + 2H2O(g) ? CO2(g) + 4H2(g) Then K1, K2 and K3 are related as ?
0

A. K3 = (K1.K2)0.5

B. K3(K1+K2)/2

C. K3 = K1.K2

D. K3 = (K1.K2)2

453. Which of the following will favour the reverse reaction in a chemical equilibrium reaction ?
0

A. Increasing the concentration of one of the reactants

B. Removal of at least one of the products at regular interval

C. None of these

D. Increasing the concentration of one or more of the products

454. For the liquid phase zero order irreversible reaction A ? B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1min-1. What will be the conversion for a PFR with a space velocity of 0.2 min-1? Assume that all the other operating conditions are the same for CSTR and PFR ?
0

A. 0.3

B. 0.60

C. 0.15

D. 0.9

455. The reactions of high molecularity are rare, because________________?
0

A. Many body collisions are not favoured energetically

B. Of requirement of very large concentration for such reactions

C. Of low probability of many body collisions

D. Of very large activation energy of many bodies

456. With increase in temperature, the equilibrium _______________ rises in case of endothermic reaction?
0

A. Constant

B. Conversion

C. Both A. & B.

D. Neither A. nor B.

457. In an ideal tubular-flow reactor_________________?
0

A. There is a uniform velocity across the radius

B. All A., B. and C.

C. Mixing takes place in radial direction

D. There is no mixing in longitudinal direction

458. A Catalyst ____________________?
0

A. None of these

B. Shortens the time to reach the equilibrium

C. Changes the equilibrium constant of the reaction

D. Increases the equilibrium concentration of the product

459. For reactions in parallel viz A ? P (desired product) and A ? Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a_________________?
0

A. Batch reactor is preferred over a single CSTR for high yield

B. Tubular reactor is preferred over a single CSTR for high yield

C. Both A. and B.

D. Single CSTR is the most suitable

460. Transition state theory relates the above quantities as___________________?
0

A. k ? ?T

B. k ? T1.5

C. k ? e-E/RT

D. k ? T.eE/RT

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