chemical engineering Mcqs
8452. Equilibrium constant decreases as the temperature___________________?
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A. None of these

B. Decreases, for an exothermic reaction

C. Increases, for an exothermic reaction

D. Increases, for an endothermic reaction

8461. Internal energy is independent of the ____________ for an ideal gas?
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A. Pressure

B. Volume

C. Both A. & B.

D. Neither A. nor B.

8462. For a multi-component system, the term chemical potential is equivalent to the ___________________?
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A. Molar free energy change

B. Partial molar free energy

C. Molal concentration difference

D. Molar free energy

8468. A gas shows deviation from ideal behaviour at______________?
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A. Low temperature and high pressure

B. High temperature and high pressure

C. Low pressure and low temperature

D. Low pressure and high temperature

8469. The expression for entropy change, ?S = n Cp . ln (T2/T1), is valid for the ______________ of a substance?
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A. Simultaneous pressure & temperature change

B. Heating

C. Cooling

D. Both B. and C
8471. The activity of an ideal gas is numerically ____________ its pressure?
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A. Equal to

B. Less than

C. Data insufficient, cant be predicted

D. More than

8472. The expression, nCv(T2 T1), is for the _____________ of an ideal gas?
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A. Compressibility

B. Co-efficient of thermal expansion

C. None of these

D. Work done under adiabatic condition
8473. Heat of reaction is not influenced by__________________?
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A. The route/method through which final products are obtained

B. The physical state (e.g., solid, liquid or gaseous) of reactants and products

C. Whether the reaction is carried out at constant temperature or constant pressure

D. None of these

8474. (1/V) (?V/?T)P is the mathematical expression__________________?
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A. Joule-Thomson co-efficient

B. Specific heat at constant volume (CV)

C. co-efficient of thermal expansion

D. Specific heat at constant pressure (Cp)

8475. Pick out the wrong statement ?
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A. At constant pressure, solubility of a gas in a liquid diminishes with rise in temperature

B. Normally, the gases which are easily liquefied are more soluble in common solvents

C. The gases which are capable of forming ions in aqueous solution are much more soluble in

D. er than in other solvents

E. At constant pressure, solubility of a gas in a liquid increases with rise in temperature

8476. Joule-Thomson co-efficient depends on the_____________________?
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A. Pressure

B. Temperature

C. Both A. & B

D. Neither A. nor B

8477. In a reversible process__________________?
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A. Tds = dE + dW

B. dW dE = Tds

C. Tds dW + dE >0

D. dE dW = Tds

8479. Pick out the wrong statement ?
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A. rogen is 4

B. Enthalpy and internal energy change is zero during phase change processes like melting,

C. For a two phase system in equilibrium made up of four non-reacting chemical species, the

D. orisation and sublimation</strong>

E. ber of degrees of freedom is 4

F. Minimum number of degree of freedom of a system is zero

8481. Kinetic theory of gases stipulates that, the____________________?
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A. Molecules possess appreciable volume

B. Energy is lost during molecular collisions

C. None of these

D. Absolute temperature is a measure of the kinetic energy of molecules
8484. Entropy is a/an___________________?
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A. State function

B. Extensive property

C. None of these

D. Macroscopic property

8486. The vapor pressure of water at 100C is__________________?
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A. 760 mm wc

B. 100 N/m2

C. 13.6 cms of Hg

D. 76 cms of Hg
8488. is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions ?
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A. . The amount of work needed is path dependent

B. The amount of work needed is independent of path

C. work needed

D. Work alone cannot bring out such a change of state

E. More information is needed to conclude anything about the path dependence or otherwise of

8491. In an irreversible process________________?
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A. Tds dT + dW < 0

B. Tds = dE dW = 0

C. Tds dE + dW < 0

D. dE dW Tds = 0

8492. Clausius-Clapeyron Equation gives accurate result, when the __________________?
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A. Volume in the liquid state is negligible compared with that in the vapour state

B. Vapour pressure is relatively low and the temperature does not vary over wide limits

C. All A, B. and C

D. Vapour obeys the ideal gas law and the latent heat of vaporisation is constant

8493. Joule-Thomson experiment is__________________?
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A. Isobaric

B. Adiabatic

C. Isenthalpic

D. Both B. & C.
8494. A closed system is cooled reversibly from 100C to 50C. If no work is done on the system________________?
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A. its internal energy (U) decreases and its entropy (S) increases

B. U and S both decreases

C. U decreases but S is constant

D. U is constant but S decreases

8498. In the ammonia synthesis reaction, N2 + 3H2 ? 2NH3 + 22.4 kcal, the formation of NH3 will be favoured by___________________?
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A. High temperature

B. Low pressure

C. Low temperature only

D. Both low temperature and high pressure
8499. The thermodynamic law, PVy = constant, is not applicable in case of______________?
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A. Free expansion of an ideal gas

B. Adiabatic compression of a perfect gas

C. Ideal compression of air

D. Adiabatic expansion of steam in a turbine