Chemical Engineering MCQs

Page No. 164

When liquid and vapour phase of multi-component system are in equilibrium (at a given temperature and pressure), then chemical potential of each component is___________________?


aSame in both the phases


bZero in both the phases


cMore in vapour phase


dMore in liquid phase



Which is not a refrigerant ?


aSO2


bNH3


cCCl2F2


dC2H4Cl2


View Answer C2H4Cl2

Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which___________________?


aA homogeneous solution (say of phenol water) is formed


bMutual solubility of the two liquids shows a decreasing trend


cTwo liquids are completely separated into two layers


dNone of these



Maxwell’s relation corresponding to the identity, dH = dS = Vdp + Σμi dni is_____________________?


a(∂T/∂V)S, ni = -(∂P/∂S)V, ni


b (∂S/∂P)T, ni = (∂V/∂T)P, ni


c(∂S/∂V)T, ni = (∂P/∂T)V, ni


d(∂T/∂P)S, ni = (∂V/∂S)P, ni



A system is said to be isopiestic, if there is no ______________ change?


aTemperature


bPressure


cVolume


dNone of these


View Answer Pressure

What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor ?


a2


b 0


c 3


d1


View Answer 2

Gibbs-Duhem equation_____________________?


aStates that n1dμ1 + n2dμ2 + ….njdμj = 0, for a system of definite composition at constant temperature and pressure


b Applies only to binary systems


cFinds no application in gas-liquid equilibria involved in distillation


dNone of these



Entropy change of mixing two liquid substances depends upon the_________________?


aMolar concentration


bQuantity (i.e. number of moles)


cBoth A. and B


dNeither A. nor B


View Answer Both A. and B

Free energy change at equilibrium is____________________?


aZero


bPositive


cNegative


d Indeterminate


View Answer Zero

Extensive properties of a thermodynamic system depend upon the _____________ of the system?


aSpecific volume


bTemperature


cMass


d Pressure


View Answer Mass

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