A. 5.6 × 10-4

**B. 8.5 × 10-4**

C. 5.6 × 10-3

D. 8.5 × 10-3

### Related Mcqs:

- H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in meters) corresponding to an operating line given by, y = 5x + 0.001 is ______________________?
**A. 2.0**

B. 1.56

C. 1.0

D. 0.56 - In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of _______________ is zero?
**A. Interface**

B. Gas phase

C. Liquid phase

D. All A , B. & C. - For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG: mass transfer co-efficient, moles/m2, a: interfacial area per unit volume of tower) ?
**A. G/(FG . a)**

B. FG/(G . a)

C. (G . a)/FG

D. L/(FG . G) - The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp= M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force) ?
A. Kc = Kp = Km

B. Kc = Kp/RT = Km . RT/P

**C. Kc = Kp . RT = Km . RT/p**

D. None of these - In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raffinate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg) ?
A. 6.89

**B. 8.89**

C. 10

D. 8.25 - With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop___________________?
A. Decreases

B. Remains unchanged

**C. Increases**

D. Decreases exponentially - When the liquid phase and vapour phase of a binary system obeys Raoult’s and Dalton’s law respectively, the relative volatility is the ratio of________________________?
**A. Vapour pressure of component A to that of component B**

B. Vapour pressure of component A to the total pressure

C. Vapour pressure of component A to the partial pressure of A

D. Partial pressure of component A to the total pressure - In a liquid-liquid extraction, 10 kg of a solution containing 2 kg of solute C and 8 kg of solvent A is brought into contact with 10 kg of solvent B. Solvent A and B are completely immiscible in each other whereas solute C is soluble in both the solvents. The extraction process attains equilibrium. The equilibrium relationship between the two phases is Y* = 0.9X, where Y* is the kg of C/kg of B and X is kg of C/kg of A. Choose the correct answer?
**A. The entire amount of C is transferred to solvent B**

B. Less than 2 kg but more than 1 kg of C is transferred to solvent B

C. Less than 1 kg of C is transferred to B

D. No amount of C is transferred to B - Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m2 and the solvent flow, rate is 400 moles of S/m2. hr. The equilibrium data is represented by Y = 3X2 , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is_________________________?
A. 25%

**B. 50%**

C. 70%

D. 90% - The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m2/m3) ?
**A. 500**

B. 1200

C. 900

D. 800