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4

The number of degrees of freedom for an azeotropic mixture in a two component vapour-liquid equilibria is/are

A. Zero

B. One

C. Two

D. Three

Correct Answer :

B. One


Related Questions

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4

Which of the following is not an intensive property?

A. Molar heat capacity

B. Internal energy

C. Viscosity

D. None of these

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4

It is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions.

A. The amount of work needed is path dependent

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

C. The amount of work needed is independent of path

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

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4

Heat pump

A. Accomplishes only space heating in winter

B. Accomplishes only space cooling in summer

C. Accomplishes both (A) and (B)

D. Works on Carnot cycle

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4

Maximum work that could be secured by expanding the gas over a given pressure range is the __________ work.

A. Isothermal

B. Adiabatic

C. Isentropic

D. None of these

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4

In the reaction, represented by, 2SO2 + O2 2SO3; ΔH = - 42 kcal; the forward reaction will be favoured by

A. Low temperature

B. High pressure

C. Both (A) and (B)

D. Neither (A) nor (B)

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4

Joule-Thomson co-efficient which is defined as, η = (∂T/∂P)H = 1/Cp (∂H/∂T)P, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is

A. 0

B.

C. +ve

D. -ve

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4

Van Laar equation deals with the activity coefficients in

A. Binary solutions

B. Ternary solutions

C. Azeotropic mixture only

D. None of these

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4

Which of the following is not a common refrigerant?

A. Freon-12

B. Ethylene

C. Ammonia

D. Carbon dioxide

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4

Pick out the wrong statement.

A. System (of partially miscible liquid pairs), in which the mutual solubility increases with rise in temperature, are said to possess an upper consolute temperature

B. Systems, in which the mutual solubility increases with decrease in temperature, are said to possess lower consolute temperature

C. Nicotine-water system shows both an upper as well as a lower consolute temperature, implying that they are partially miscible between these two limiting temperatures

D. None of these

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4

The chemical potential of any constituent of an ideal solution depends on the __________ of the solution.

A. Temperature

B. Pressure

C. Composition

D. All (A), (B) and (C)

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4

The partial pressure of each constituent present in an alloy is __________ the total vapor pressure exerted by the alloy.

A. Less than

B. Equal to

C. More than

D. Either (B) or (C); depends on the type of alloy

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4

What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T1 and T2 are source & surrounding temperatures respectively.)?

A. TR/(T2 - TR) × (T1 - T2)/T1

B. TR/(T2 - TR) × T1/(T1 - T2)

C. TR/(T1 - TR) × (T1 - T2)/T1

D. None of these

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4

Entropy is a measure of the __________ of a system.

A. Disorder

B. Orderly behaviour

C. Temperature changes only

D. None of these

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4

Third law of thermodynamics is helpful in

A. Prediction of the extent of a chemical reaction

B. Calculating absolute entropies of substances at different temperature

C. Evaluating entropy changes of chemical reaction

D. Both (B) and (C)

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4

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

A. Entropy

B. Internal energy

C. Enthalpy

D. Gibbs free energy

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4

Which of the following exemplifies an adiabatic process?

A. Melting of ice

B. Condensation of alcohol vapor

C. Sudden bursting of a cycle tube

D. Evaporation of water

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4

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

A. 300 × (32/7)

B. 300 × (33/5)

C. 300 × (333/7)

D. 300 × (35/7)

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4

If the heat of solution of an ideal gas in a liquid is negative, then its solubility at a given partial pressure varies with the temperature as

A. Solubility increases as temperature increases

B. Solubility increases as temperature decreases

C. Solubility is independent of temperature

D. Solubility increases or decreases with temperature depending on the Gibbs free energy change of solution

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4

Efficiency of a Carnot engine working between temperatures T1 and T2 (T1 < T) is

A. (T2 - T1)/T2

B. (T2 - T1)/T1

C. (T1 - T2)/T2

D. (T1 - T2)/T1

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4

Specific __________ does not change during phase change at constant temperature and pressure.

A. Entropy

B. Gibbs energy

C. Internal energy

D. Enthalpy

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4

Fundamental principle of refrigeration is based on the __________ law of thermodynamics.

A. Zeroth

B. First

C. Second

D. Third

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4

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:

A. 1

B. 2

C. 3

D. 0

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4

Molar heat capacity of water in equilibrium with ice at constant pressure is __________ Kcal/kg mole. °K

A. 0

B.

C. 50

D. 100

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4

Refrigerants commonly used for domestic refrigerators are

A. Ethyl chloride or methyl chloride

B. Freon-12

C. Propane

D. NH3 or CO2

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4

Solid and liquid phases of a substance are in equilibrium at the

A. Critical temperature

B. Melting point

C. Freezing point

D. Both (B) and (C)

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4

Specific volume of an ideal gas is

A. Equal to its density

B. The reciprocal of its density

C. Proportional to pressure

D. None of these

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4

The second law of thermodynamics states that

A. The energy change of a system undergoing any reversible process is zero

B. It is not possible to transfer heat from a lower temperature to a higher temperature

C. The total energy of system and surrounding remains the same

D. None of the above

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4

Refrigeration capacity of a household refrigerator may be round about __________ tons.

A. 0.15

B. 1.5

C. 4.5

D. 6.5

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4

At __________ point, all the three phases (i.e. solid, liquid and gas) co-exist.

A. Eutectic

B. Triple

C. Plait

D. Critical

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4

Which of the following decreases with increase in pressure?

A. Melting point of ice

B. Melting point of wax

C. Boiling point of liquids

D. None of these