7861. The rate of the chemical reaction A → B doubles as the concentration of A i.e.., CA is doubled. If rate of reaction is proportional to CAn, then what is the value of n for this reaction?
0.5
1
0
2
✅ The correct answer is option B.
Chemical Engineering
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7862. In a semi-batch reactor
Velocity of reaction can be controlled
Maximum conversion can be controlled
Both the reactants flow counter-currently
Residence time is constant
✅ The correct answer is option A.
7863. Collision theory gives the rate constant for bimolecular reaction as
K α √T.e-E/RT
K α eE/RT
K α e-E/RT
None of these
✅ The correct answer is option C.
7864. The rate of the heterogenous 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 isA. absorption of A.
Absorption of A
Surface reaction between absorbed A and absorbed B
Surface reaction between absorbed A and B in the gas phase
Surface reaction between A in the gas phase and absorbed B
✅ The correct answer is option C.
7865. A plug-flow reactor is characterised by
High capacity
Presence of axial mixing
Presence of lateral mixing
Constant composition and temperature of reaction mixture
✅ The correct answer is option C.
7866. A reaction which is catalysed by a base is catalysed by all substances which have a tendency to
Lose a proton
Gain a proton
Gain an electron
None of these
✅ The correct answer is option B.
7867. Pick out the correct statement
Reactions with high activation energies are very temperature sensitive
Chemical equilibrium is a static state
A photochemical reaction is catalysed by light
A chemical reaction occurs when the energy of the reacting molecule is less than the activation energy of the reaction
✅ The correct answer is option A.
7868. Kinetics of a solid catalysed reaction can best be studied in a __________ reactor.
Batch
Plug-flow
Mixed
None of these
✅ The correct answer is option C.
7869. A catalyst loses its activity due to
Loss in surface area of the active component
Agglomeration of metal particles caused by thermal sintering of the solid surface
Covering of the catalytic active sites by a foregin substance
All of the above
✅ The correct answer is option D.
7870. Which of the following is an autocatalytic reaction?
Photochemical reactions
Microbial fermentation reaction
Enzyme fermentation reaction
Ammonia synthesis reaction
✅ The correct answer is option B.