Chemical Engineering MCQs

Page No. 90

Solid and liquid phases of a substance are in equilibrium at the____________________?


a Critical temperature


bMelting point


c Freezing point


dBoth B. and C


View Answer Both B. and C

For an isothermal reversible compression of an ideal gas_______________?


aOnly ΔE = 0


bOnly ΔH =0


cΔE = ΔH = 0


ddQ = dE


View Answer ΔE = ΔH = 0

The minimum number of phases that can exist in a system is________________?


a 0


b1


c2


d3


View Answer 1

In the equation, PVn = constant, if the value of n = 1, then it represents a reversible _____________ process?


aIsothermal


bIsobaric


cPolytropic


dAdiabatic


View Answer Isothermal

The absolute entropy for all crystalline substances at absolute zero temperature is ____________________?


aZero


bNegative


cMore than zero


dIndeterminate


View Answer Zero

For spontaneous changes in an isolated system (S = entropy) ___________________?


ads = 0


bds <0


cds > 0


d ds = Constant


View Answer ds > 0

For an exothermic reaction ____________________?


aOnly enthalpy change (ΔH) is negative


bOnly internal energy change (ΔE) is negative


cBoth ΔH and ΔE are negative


dEnthalpy change is zero



Joule-Thomson effect i.e., a throttling process is a constant _____________ process?


aEntropy


bTemperature


cInternal energy


dEnthalpy


View Answer Enthalpy

Which of the following is Virial equation of state ?


a (p + a/V2)(V – b) = nRT


b PV = nRT


cPV = A + B/V + C/V2 + D/V3 + …


dNone of these



Specific ____________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.)?


aEntropy


bInternal energy


cEnthalpy


dGibbs free energy


View Answer Gibbs free energy

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