chemical engineering Mcqs
8101. ____________ explains the equilibrium constant for any chemical reaction?
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A. Henrys law

B. Law of mass action

C. None of these

D. Hesss law

8102. The number of degree of freedom for an Azeotropic mixture of ethanol and water in vapourliquid equilibrium, is__________________?
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A. 1

B. 0

C. 3

D. 2

8103. A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0C, 760 mm Hg) will be _____________ litres?
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A. Data insufficient; cant be computed

B. 22.4

C. 224

D. 448
8104. Which is a state function ?
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A. Work

B. Specific volume

C. Pressure

D. Temperature

8105. Chemical potential of ith component of a system is given by________________?
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A. ?i = (?F/?ni)T, P, ni

B. ?i = (?F/?ni)T, P

C. ?i = (?A/?ni)T, P, ni

D. ?i = (?A/?ni)T, P

8106. Joule-Thomson effect i.e., a throttling process is a constant _____________ process?
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A. Entropy

B. Enthalpy

C. Temperature

D. Internal energy

8107. If two gases have same reduced temperature and reduced pressure, then they will have the same____________________?
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A. Critical temperature

B. Mass

C. Volume

D. None of these
8108. Equilibrium constant of a reaction varies with the____________________?
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A. Pressure

B. Initial concentration of the reactant

C. None of these

D. Temperature
8109. A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is ?i yi P = Yi xifi where, ? 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 ______________________?
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A. Temperature and pressure only

B. Temperature, pressure and liquid composition xi only

C. Temperature only

D. Temperature, pressure, liquid composition xi and vapour composition yi

8110. Which of the following has the least thermal efficiency ?
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A. Otto engine

B. Steam engine

C. Carnot engine

D. Diesel engine

8111. A refrigeration cycle is the same as a _____________ cycle?
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A. None of these

B. Turbine

C. Heat engine

D. Reversed heat engine
8112. In the reaction, C + O2 ? CO2; ?H = 94 kcal. What is the heat content (enthalpy) of O2 ?
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A. -94 kcal

B. Zero

C. < 94 kcal

D. > -94 kcal

8113. What is the degree of freedom for a system comprising liquid water equilibrium with its vapour ?
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A. 1

B. 3

C. 2

D. 0

8114. Vapour which is at a pressure smaller than the saturation pressure for the temperature involved is called a _____________ vapour?
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A. None of these

B. Superheated

C. Desuperheated

D. Non-condensable

8115. The heat capacities for the ideal gas state depend upon the_________________?
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A. Pressure

B. Temperature

C. Both A. & B.

D. Neither A. nor B.

8116. When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change. This is called the_______________?
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A. Law of corresponding state

B. Le-Chatelier principle

C. Arrhenius hypothesis

D. Kopps rule

8117. In a working refrigerator, the value of COP is always__________________?
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A. < 0

B. < 1

C. > 1

D. 0

8118. Which of the following is affected by the temperature ?
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A. All A, B. & C

B. Activity co-efficient

C. Fugacity

D. Free energy

8119. The work done in isothermal compression compared to that in adiabatic compression will be__________________?
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A. Less

B. Same

C. More or less depending upon the extent of work done

D. More
8120. At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (?) is given by (where, ? = standard chemical potential at unit fugacity (f = 1 atm.) and the gas behaves ideally.) ?
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A. ? + RT ln f

B. ?+ R ln f

C. ? + R/T ln f

D. ? + T ln f

8121. Which of the following is an extensive property of a system ?
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A. Concentration

B. Pressure

C. Molal heat capacity

D. Heat capacity
8122. Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of______________?
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A. Vaporisation

B. Transition

C. None of these

D. Fusion

8123. Activity co-efficient is a measure of the____________________?
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A. Vapour pressure of liquid

B. Departure of gas phase from ideal gas law

C. None of these

D. Departure from ideal solution behaviour
8124. In the equation, PVn = constant, if the value of n = 1, then it represents a reversible _____________ process?
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A. Polytropic

B. Isobaric

C. Isothermal

D. Adiabatic

8125. 1st law of thermodynamics is nothing but the law of conservation of___________________?
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A. Energy

B. Momentum

C. None of these

D. Mass

8126. Cp of a gas at its critical temperature and pressure_______________?
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A. Becomes infinity

B. Equals 0.24 kcal/kmol K

C. Equals 1 kcal/kmol K

D. Becomes zero

8127. The compressibility factor for an ideal gas is 1. Its value for any other real gas is_______________?
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A. 1

B. Either B. or C, depends on the nature of the gas

C. 1

8128. If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them. This is ______________ law?
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A. Kirchoffs

B. None of these

C. Hesss

D. Lavoisier and Laplace

8129. ______________ Equation predicts the activity co-efficient from experimental data ?
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A. Lewis-Randall

B. Margules

C. Van Laar

D. Both B. & C.
8130. Fugacity and pressure are numerically equal, when the gas is____________________?
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A. In standard state

B. In ideal state

C. At high pressure

D. At low temperature

8131. Entropy of a substance remains constant during a/an ____________ change?
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A. Irreversible isothermal

B. Reversible adiabatic

C. None of these

D. Reversible isothermal

8132. Kopps rule is used to calculate the heat capacity of___________________?
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A. Liquids

B. Gases

C. All (A), B. & (C)

D. Solids
8133. (?T/?P)H is the mathematical expression for__________________?
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A. Specific heat at constant volume (Cv)

B. None of these

C. Specific heat at constant pressure (Cp)

D. Joule-Thompson co-efficient
8134. Requisites of a reversible process is that the ____________________?
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A. Friction in the system should be absent

B. System and surroundings temperature be equal

C. System and surroundings pressure be equal

D. None of these

8135. Specific ____________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.)?
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A. Gibbs free energy

B. Enthalpy

C. Internal energy

D. Entropy

8136. If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the____________________?
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A. Process must be isobaric

B. Temperature must decrease

C. Process must be adiabatic

D. Both B. and C.
8137. Cp Cv = R is valid for ______________ gases?
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A. All of the above

B. Very low temperature

C. Ideal

D. Very high pressure

8138. The minimum number of phases that can exist in a system is________________?
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A. 1

B. 0

C. 2

D. 3

8139. The specific heat of saturated water vapour at 100C is__________________?
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A. an data-mce-type="bookmark" style="width: 0px;overflow: hidden;line-height: 0" class="mce_SELRES_start">?</span>A. ?

B. 0

C. #NAME?

D. -ve
8140. Cv for an ideal gas__________________?
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A. Does not depend upon temperature

B. Is independent of pressure only

C. Is independent of volume only

D. Is independent of both pressure and volume
8141. What happens in a reversible adiabatic compression ?
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A. Temperature is constant

B. Cooling occurs

C. Pressure is constant

D. Heating occurs
8142. In a homogeneous solution, the fugacity of a component depends upon the __________________?
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A. All (A), B. and (C)

B. Pressure

C. Composition

D. Temperature

8143. As the temperature is lowered towards the absolute zero, the value of the quantity (??F/?T) approaches________________?
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A. Zero

B. Unity

C. None of these

D. Infinity

8144. For spontaneous changes in an isolated system (S = entropy) ___________________?
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A. ds = 0

B. ds > 0

C. ds <0

D. ds = Constant

8145. Which of the following exemplifies an adiabatic process ?
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A. Evaporation of water

B. Melting of ice

C. Condensation of alcohol vapor

D. Sudden bursting of a cycle tube
8146. Which one is true for a throttling process ?
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A. The inversion temperature is same for all gases

B. A gas may have more than one inversion temperatures

C. The inversion temperature is different for different gases

D. The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity

8147. Which of the following is not a reversible process ?
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A. Solution of NaCl in water at 50C

B. None of these

C. Expansion of an ideal gas against constant pressure

D. Atmospheric pressure vaporisation of water at 100C

8148. The equation, (d loge PA/d loge xA) = (d loge PA/d loge xB) applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the _____________ equation?
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A. Van Laar

B. Gibbs-Duhem-Margules

C. Gibbs-Duhem

D. Margules

8149. All gases during throttling process at atmospheric temperature and pressure show a cooling effect except__________________?
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A. O2

B. H2

C. N2

D. CO2

8150. The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of________________?
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A. T and Z

B. T, P and Z

C. T and P

D. T