A. Low vapor pressure
B. Low viscosity
C. High gas solubility
D. None of these
Related Mcqs:
- 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 - Which of the following is an undesirable property for an absorbing solvent ?
A. Low vapour pressure
B. Low velocity
C. Low freezing point
D. None of these - The individual mass transfer co-efficients (moles/m2s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?
A. Liquid side
B. Gas side
C. Interfacial
D. Both liquid and gas side - The individual mass transfer co-efficients (moles/m2s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?
A. Liquid side
B. Gas side
C. Interfacial
D. Both liquid and gas side - To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate) ____________________?
A. Increase both ‘G’ and ‘S’
B. Decrease both ‘G’ and ‘S’
C. Increase ‘S’ and decrease ‘G’
D. Increase ‘G’ and decrease ‘S’ - 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) - 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 - In a gas-liquid absorption column, for obtaining the maximum absorption efficiency___________________?
A. Liquid stream should be distributed uniformly
B. Gas stream should be distributed uniformly
C. Both gas as well as liquid streams should be distributed uniformly
D. By passing should be completely avoided - In a gas-liquid absorption column, for obtaining the maximum absorption efficiency____________________?
A. Liquid stream should be distributed uniformly
B. Gas stream should be distributed uniformly
C. Both gas as well as liquid streams should be distributed uniformly
D. By passing should be completely avoided
Answer: Option C - Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in_________________?
A. Decreased solute solubility
B. Large minimum liquid to gas (L/G) ratio
C. Large number of trays
D. All A., B. and C.
