121. In azeotropic mixture, the equilibrium vapour composition is
More than liquid composition
Less than liquid composition
Same as liquid composition
Independent of pressure
✅ The correct answer is option C.
Mass Transfer MCQs
122. Dorr thickener is an equipment used for
Classification
Sedimentation
Clarification
Leaching
✅ The correct answer is option B.
123. With increase in the concentration of the adsorbate, the integral heat of adsorption
Increases
Decreases
Remains unchanged
May increase or decrease ; depends on the type of adsorbate
✅ The correct answer is option B.
124. Mass transfer co-efficient of liquid is
Affected more by temperature than that for gases
Affected much less by temperature than that for gases
Not affected by the temperature
None of these
✅ The correct answer is option A.
125. Positive deviation from Raoult’s law means a mixture whose total pressure is
Greater than that computed for ideality
Less than that computed for ideality
Less than the sum of the vapour pressure of the components
None of these
✅ The correct answer is option A.
126. In case of liquids, the binary diffusivity is proportional to (where, T = temperature)
T
√T
T²
1/T
✅ The correct answer is option A.
127. Diffusion in concentrated solutins differs from that in dilute solutions, because of the change in the __________ with the concentration of the solution.
Degree of ideality
Viscosity
Both A & B
Neither A nor B
✅ The correct answer is option C.
128. The partial pressure distribution of an ideal gas diffusing through another stagnant ideal gas at steady state follows a/an __________ law.
Exponential
Parabolic
Linear
Cubic
✅ The correct answer is option A.
129. A minimum boiling azeotrope is exemplified by
Toluene-benzene
Acetone-carbon disulphide
Water-isobutyl alcohol
None of these
✅ The correct answer is option B.
130. The relative saturation of an unsaturated mixture of gas and vapor is independent of the
Nature of the vapor
Temperature of the mixture
Composition of the mixture
None of these
✅ The correct answer is option D.