When the gas to be dissolved in liquid is a/an __________ then normally
co-current adsorber are used.
(A) Mixture of two gases
(B) Pure gas
(C) Ideal gas
(D) Sparingly soluble gas
Description : Co-current absorbers are usually used when the gas to be dissolved in the liquid is (A) Sparingly soluble (B) Highly soluble (C) A pure substance (D) A mixture
Last Answer : (C) A pure substance
Description : For absorbing a sparingly soluble gas in a liquid (A) Gas side mass transfer co-efficient should be increased (B) Liquid side mass transfer co-efficient should be increased (C) Liquid side mass transfer co-efficient should be decreased (D) Mass transfer co-efficient must be kept constant
Last Answer : (B) Liquid side mass transfer co-efficient should be increased
Description : For absorbing a sparingly soluble gas in a liquid, the (A) Gas side co-efficient should be increased (B) Liquid side coefficient should be increased (C) Gas side co-efficient should be decreased (D) Liquid side co-efficient should be decreased
Last Answer : (B) Liquid side coefficient should be increased
Description : Pick out the wrong statement (A) Co-current absorbers are usually used, when the gas to be dissolved in the liquid is a pure substance (B) In case of gas absorption, HETP is ... reaction (D) In actual practice, absorption is an endothermic process, while stripping is an exothermic process
Last Answer : (D) In actual practice, absorption is an endothermic process, while stripping is an exothermic process
Description : Pick out the wrong statement. (A) At constant pressure, solubility of a gas in a liquid diminishes with rise in temperature (B) Normally, the gases which are easily liquefied are more soluble ... (D) At constant pressure, solubility of a gas in a liquid increases with rise in temperature
Last Answer : (A) At constant pressure, solubility of a gas in a liquid diminishes with rise in temperature
Description : Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is (A) Insoluble in the liquid (B) Soluble in the liquid (C) Non-ideal in nature (D) At a fixed temperature
Last Answer : (A) Insoluble in the liquid
Description : . In contact process, SO3 is absorbed in 97% H2SO4 and not in water, because (A) SO3 gas is sparingly soluble in water (B) Water forms an acid mist, which is difficult to absorb (C) The purity of acid is affected (D) Scale formation in the absorber is to be avoided
Last Answer : (B) Water forms an acid mist, which is difficult to absorb
Description : Pick out the wrong statement. (A) Activity co-efficient is dimensionless. (B) In case of an ideal gas, the fugacity is equal to its pressure. (C) In a mixture of ideal gases, the fugacity of ... equal to the partial pressure of the component. (D) The fugacity co-efficient is zero for an ideal gas
Last Answer : (D) The fugacity co-efficient is zero for an ideal gas
Description : `A_(3)B_(2)` is a sparingly soluble salt with molar mass `M(gmol_(-))` and solubility `x` gm `litre_(-1)`, the ratio of the molar concentration of `B^
Last Answer : `A_(3)B_(2)` is a sparingly soluble salt with molar mass `M(gmol_(-))` and solubility `x` gm `litre_(-1)`, the ... `(1)/(54)(M^(4))/(x^(4))` D. None
Description : Give an example of sparingly soluble salt?
Last Answer : Ans. AgCl
Description : Sides of equilateral-triangular co-ordinates (on which ternary liquid system is plotted) represent (A) A pure component (B) A binary mixture (C) A ternary mixture (D) Partially miscible ternary system
Last Answer : (B) A binary mixture
Description : The phenomenon occuring during pumping of a liquid solution containing dissolved gases, which may come out of the solution giving rise to gas pockets, is termed as (A) Evaporation (B) Cavitation (C) Sublimation (D) Stripping
Last Answer : (B) Cavitation
Description : Pick out the correct statement. (A) Higher hold up of the solid in the rotary dryer results in better exposure of the solids to the gas (B) The 'Hatta number' is ... reflux in case of distillation operation requires infinite number of plates for a binary system separation
Last Answer : (C) For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both components is linear in the case of steady state equimolal counter-diffusion
Description : For a ternary mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a __________ of the equilateral triangular co-ordinates. (A) Binary mixture is ... Ternary mixture is represented by the sides (D) Pure component is represented by the apex
Last Answer : (D) Pure component is represented by the apex
Description : What is a solution A. a solid dissolved in a gas B. a solute and a solvent C. a liquid dissolved in a gas D. an amalgam of solids, liquids, and gases?
Last Answer : B. A solute and a solvent
Description : 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 ... (C) Kc = Kp . RT = Km . RT/p (D) None of these
Last Answer : (C) Kc = Kp . RT = Km . RT/p
Description : Which of the following is true for Virial equation of state? (A) Virial co-efficients are universal constants (B) Virial co-efficients 'B' represents three body interactions (C) Virial co-efficients ... of temperature only (D) For some gases, Virial equations and ideal gas equations are the same
Last Answer : (C) Virial co-efficients are function of temperature only
Description : In a gas-liquid shell and tube heat exchanger, the (A) Presence of a non-condensable gas decreases the condensing film coefficient (B) Gases under high pressure are routed through the tube side, because high pressure ... water or steam condensate remain localised to the tubes (D) All 'a', 'b' & 'c'
Last Answer : (D) All 'a', 'b' & 'c'
Description : According to Avogadro's law A. the product of the gas constant and the molecular mass of an ideal gas is constant B. the sum of partial pressure of the mixture of two gases is sum of the ... all gases, at the same temperature and pressure, contain equal number of molecules D. all of the above
Last Answer : Answer: C
Description : According to Avogadro's Hypothesis (a) the molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature (b) the sum of partial pressure of ... gases have two values of specific heat (e) all systems can be regarded as closed systems.
Last Answer : Answer : a
Description : Van der Waals equation explains the behaviour of (a) Mixture of gases (b) Ideal gas (c) Real gas (d) Water gas
Last Answer : Ans:(c)
Description : 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 ... extraction achieved in the unit is (A) 25% (B) 50% (C) 70% (D) 90%
Last Answer : (B) 50%
Description : Fugacity is a measure of the (A) Escaping tendencies of the same substance in different phases of a system (B) Relative volatility of a mixture of two miscible liquids (C) Behaviour of ideal gases (D) None of these
Last Answer : (A) Escaping tendencies of the same substance in different phases of a system
Description : Pick out the wrong statement. (A) The mole fraction of solute is directly proportional to the molality of a 'dilute' solution (B) For a non-reacting binary mixture of ideal gases, the partial ... at all temperature (D) The relative volatility of a binary mixture at the Azeotropic composition is 1
Last Answer : (C) Azeotropes obey Raoult's law at all temperature
Description : The diffusivity, DAB (for component A diffusing in B) is equal to the diffusivity DBA (for component B diffusing in A) for a binary mixture of (A) Newtonian liquids (B) Non-Newtonian liquids (C) Ideal gases (D) Real gases
Last Answer : (C) Ideal gases
Description : In the desorption of highly soluble gas from the liquid, the main resistance will be in the __________ phase. (A) Gas (B) Liquid (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (B) Liquid
Description : If an ideal solution is formed by mixing two pure liquids in any proportion, then the __________ of mixing is zero (A) Enthalpy (B) Volume (C) Both 'a' & 'b' (D) Neither 'a' nor 'b'
Last Answer : (C) Both 'a' & 'b'
Description : Removal of __________ is accomplished by aeration of water. (A) Dissolved gases (B) Suspended solids (C) Dissolved solids (D) None of these
Last Answer : (A) Dissolved gases
Description : Activity co-efficient is a measure of the (A) Departure from ideal solution behaviour (B) Departure of gas phase from ideal gas law (C) Vapour pressure of liquid (D) None of these
Last Answer : (A) Departure from ideal solution behaviour
Description : Near their critical temperatures, all gases occupy volumes __________ that of the ideal gas. (A) Less than (B) Same as (C) More than (D) Half
Last Answer : (A) Less than
Description : A solution is (1) a homogeneous mixture of two or more substances (2) a solid dissolved in a liquid (3) a solid dissolved i water (4) a mixture of two liquids
Last Answer : a homogeneous mixture of two or more substances
Description : 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 ... A) Liquid side (B) Gas side (C) Interfacial (D) Both liquid and gas side
Last Answer : (B) Gas side
Description : Expert power is the power that comes from the amount of knowledge a person has obtained in a specific area. This type ofpower is: 1. Critical to a project manager because the PM has to have ... by the PM because the PM cannot stay current on all areas of expertise and also manage the project
Last Answer : 4. Used sparingly if at all by the PM because the PM cannot stay current on all areas of expertise and also manage the project
Description : What is the value of ln y (where y = activity co-efficient) for ideal gases? (A) Zero (B) Unity (C) Infinity (D) Negative
Last Answer : (A) Zero
Description : Fugacity of a component in an ideal gas mixture is equal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at constant pressure and ... increases. (A) Decreases (B) Decreases exponentially (C) Increases (D) Remain constant
Last Answer : (C) Increases
Description : If two pure liquid constituents are mixed in any proportion to give an ideal solution, there is no change in (A) Volume (B) Enthalpy (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : The theoretical minimum work required to separate one mole of a liquid mixture at 1 atm, containing 50 mole % each of n- heptane and n octane into pure compounds each at 1 atm is (A) -2 RT ln 0.5 (B) -RT ln 0.5 (C) 0.5 RT (D) 2 RT
Last Answer : (B) -RT ln 0.5
Description : Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their (A) Viscosity (B) Density (C) Solubility (D) Relative volatility
Last Answer : (C) Solubility
Description : The expression, nCv(T2- T1), is for the __________ of an ideal gas. (A) Work done under adiabatic condition (B) Co-efficient of thermal expansion (C) Compressibility (D) None of these
Last Answer : (A) Work done under adiabatic condition
Description : Relative volatility varies with the concentration of component for an ideal solution. The relative volatility of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of ... law (D) Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law
Last Answer : (D) Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law
Description : Pick out the wrong statement. (A) An ideal liquid or solid solution is defined as one in which each component obeys Raoult's law (B) If Raoult's law is applied to one component of a binary mixture; ... also (C) Henry's law is rigorously correct in the limit of infinite dilution (D) None of these
Last Answer : (D) None of these
Description : A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is φi yi P = Yi xifi° where, Φ is a vapor fugacity component, Yiis the liquid activity co- ... and liquid composition xi only (D) Temperature, pressure, liquid composition xi and vapour composition yi
Last Answer : (C) Temperature, pressure and liquid composition xi only
Description : The vacuole of a plant is composed of ____ with soluble substances dissolved within it. a. water c. oil b. juice d. minerals
Last Answer : a. water
Description : Signal normally used to study non-ideal flow by stimulus response technique is __________ input. (A) Pulse (B) Step (C) Both (A) & (B) (D) Neither (A) nor (B)
Description : Is liquid air a mixture or a pure substance?
Last Answer : Liquid air is a mixture.
Description : (3) prevents freezing of petrol Explanation: Ethylene glycol (IUPAC name: ethane-1,2-diol) is an organic compound widely used as an automotive antifreeze and a precursor to polymers. In its pure form, it is ... A mixture of 60% ethylene glycol and 40% water freezes at -45 degree C (- 49 degree F).
Last Answer : Rust is - (1) A mixture of Fe₂O₃ and Fe(OH) ₂ (2) A mixture of FeO and Fe(OH)₂ (3) FeO only (4) A mixture of Fe₂O₃, 3H₂O and FeO
Description : In general, the limit of inflammability/explosion limit of fuel gases is widened by the (A) Increase in gas pressure (B) Increase in temperature (i.e. preheating) (C) Use of pure oxygen for combustion instead of air (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : Mass transfer co-efficient of liquid is (A) Affected more by temperature than that for gases (B) Affected much less by temperature than that for gases
Last Answer : (A) Affected more by temperature than that for gases
Description : __________ is the temperature at which a gas-vapor mixture becomes saturated, when cooled at constant total pressure out of contact with a liquid. (A) Dew point (B) Bubble point (C) Dry bulb temperature (D) Wet bulb temperature
Last Answer : (A) Dew point
Description : Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the __________ temperature. (A) Dry-bulb (B) Wet-bulb (C) Dew point (D) Adiabatic saturation
Last Answer : (B) Wet-bulb