7761. The vessel dispersion number (D/μL) for plug flow is
0
500
750
∞
✅ The correct answer is option A.
Chemical Engineering
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7762. The excess energy of reactants in a chemical reaction required to dissociate into products is termed as the __________ energy.
Activation
Potential
Binding
Threshold
✅ The correct answer is option A.
7763. The exit age distribution curve E(t) for an ideal CSTR with the average residence time, τ, is given by
E-t/τ
E-t/τ/T
1 – e-t/τ
1 – (e-t/τ/T)
✅ The correct answer is option B.
7764. Photo-chemical reactions occur in presence of
Sunlight
Darkness
Solid catalysts
Monochromatic radiation only
✅ The correct answer is option A.
7765. The catalytic converter for conversion of SO₂ to SO₃ by contact process should have a feed with SO₂ content between
2-5%
7-10%
12-15%
20-25%
✅ The correct answer is option B.
7766. Space time in flow reactor is
Usually equal to the residence time
The reciprocal of the space velocity
A measure of its capacity
Both A and B
✅ The correct answer is option D.
7767. The reactions of high molecularity are rare, because
Of very large activation energy of many bodies
Of low probability of many body collisions
Many body collisions are not favoured energetically
Of requirement of very large concentration for such reactions
✅ The correct answer is option B.
7768. The units of frequency factor in Arhenious equation
Are the same as those of the rate constant
Depend on the order of the reaction
Depend on temperature, pressure etc. of the reaction
Are cycles per unit time
✅ The correct answer is option A.
7769. For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate – rA0 is invariant with total pressure. The rate controlling step is
Surface Kc/(1 + TS) reaction between absorbed A and B in the gas phase
Surface reaction between absorbed A and absorbed B
Surface reaction between A in the gas phase and absorbed B
Desorption of C
✅ The correct answer is option D.
7770. Rate of an autocatalytic chemical reaction is a function of
Temperature only
Pressure only
Composition only
All of the above
✅ The correct answer is option D.