Chemical Engineering MCQs

Page No. 90

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


a Critical temperature

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bMelting point

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c Freezing point

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dBoth B. and C

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View Answer Both B. and C

For an isothermal reversible compression of an ideal gas_______________?


aOnly ΔE = 0

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bOnly ΔH =0

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cΔE = ΔH = 0

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ddQ = dE

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View Answer ΔE = ΔH = 0

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


a 0

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b1

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c2

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d3

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View Answer 1

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


aIsothermal

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bIsobaric

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cPolytropic

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dAdiabatic

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View Answer Isothermal

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


aZero

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bNegative

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cMore than zero

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dIndeterminate

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View Answer Zero

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


ads = 0

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bds <0

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cds > 0

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d ds = Constant

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View Answer ds > 0

For an exothermic reaction ____________________?


aOnly enthalpy change (ΔH) is negative

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bOnly internal energy change (ΔE) is negative

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cBoth ΔH and ΔE are negative

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dEnthalpy change is zero

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


aEntropy

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bTemperature

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cInternal energy

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dEnthalpy

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View Answer Enthalpy

Which of the following is Virial equation of state ?


a (p + a/V2)(V – b) = nRT

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b PV = nRT

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cPV = A + B/V + C/V2 + D/V3 + …

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dNone of these

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


aEntropy

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bInternal energy

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cEnthalpy

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dGibbs free energy

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View Answer Gibbs free energy

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