Chemical Engineering MCQs

Page No. 75

Henry’s law is closely obeyed by a gas, when its _____________ is extremely high?


a Pressure

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b Solubility

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c Temperature

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dNone of these

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View Answer None of these

“Dry ice” is________________?


aMoisture free ice

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b Solid helium

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cSolid carbon dioxide

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d None of these

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View Answer Solid carbon dioxide

What is the ratio of adiabatic compressibility to isothermal compressibility ?


a1

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b< 1

✓


c> 1

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d>> 1

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View Answer < 1

Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is___________________?


a300 × (32/7)

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b300 × (33/5)

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c300 × (333/7)

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d300 × (35/7)

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View Answer 300 × (32/7)

The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are ?


a1

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b 2

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c3

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d0

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View Answer 2

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, Yi is the liquid activity coefficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of ______________________?


aTemperature only

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bTemperature and pressure only

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cTemperature, pressure and liquid composition xi only

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d Temperature, pressure, liquid composition xi and vapour composition yi

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Gibbs-Duhem equation relates composition in liquid phase and the _____________ at constant temperature & pressure?


a Fugacity

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bPartial pressure

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cActivity co-efficient

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dAll (A), (B), and (C)

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View Answer All (A), (B), and (C)

Critical temperature is defined as the temperature above which a gas will____________________?


aNot liquify (barring exceptions)

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b Immediately liquify

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c Never liquify however high the pressure may be

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dNone of these

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The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for ______________________?


aReversible isothermal volume change

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b Heating of a substance

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cCooling of a substance

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dSimultaneous heating and expansion of an ideal gas

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With increase in reduced temperature, the fugacity co-efficient of a gas at constant reduced pressure___________________?


aIncreases

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b Decreases

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cRemain same

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dDecreases linearly

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View Answer Increases

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