CHEMICAL THERMODYNAMICS MCQs

By: Prof. Dr. Fazal Rehman | Last updated: February 3, 2024

CHEMICAL THERMODYNAMICS MCQs

Which is not an intensive property?

  1. Entropy
  2. Refractive index
  3. Specific gravity
  4. Melting point

Entropy

is the branch of chemistry that deals with the basic principles governing energy changes during numerous processes/

  1. Wave mechanics
  2. Chemical thermodynamics
  3. Chemical kinetics
  4. Electrochemistry

Chemical thermodynamics

________ system is a system which can exchange energy as well as matter with its surroundings.

  1. Open system
  2. Inert system
  3. Closed system
  4. Isolated system

Open system

A closed system is one which can exchange with surroundings

  1. Matter but not energy
  2. Neither matter nor energy
  3. Both matter and energy
  4. Energy but not matter

Energy but not matter

Which is not an extensive property?

  1. Free energy
  2. Entropy
  3. Work
  4. Volume

Work

∆H and ∆E are related as.

  1. ∆E = ∆H+ ∆PV
  2. ∆E = ∆H – P∆F
  3. ∆H = ∆E+ P∆V
  4. ∆H = ∆E-P∆S

∆H = ∆E+ P∆V

In an isochoric process

  1. Volume remains constant
  2. Pressure remains constant
  3. Energy remains constant
  4. Temperature remains constant

Volume remains constant

Which is forever true for the adiabatic expansion of a gas?

  1. Temperature rises
  2. Pressure rises
  3. Q = 0
  4. W = 0

Q = 0

A process in which no heat/mass enters or leaves the system is called

  1. Adiabatic
  2. Isochoric
  3. Isobaric
  4. Isothermal

Adiabatic

The variation of enthalpy of reaction with temperature is given by

  1. Kirchhoff’s equation
  2. Classius-Clapayron equation
  3. Hesse’s law
  4. Arrhenius equation

Kirchhoff’s equation

Internal energy does not include which of the following?

  1. Nuclear energy
  2. Vibrational energy
  3. Rotational energy
  4. Energy of gravitational pull

Energy of gravitational pull

Which statements is not related to applications and limitations of first law of thermodynamics?

  1. It is silent about the direction of heat
  2. It is silent about the source of heat
  3. This law explains why chemical reactions proceed to completion
  4. It does not tell us about the reversible process

This law explains why chemical reactions proceed to completion

Which statements is not related with Joule-Thomson Effect?

  1. Joule-Thomson coefficient is defined as με = (ϱP/ϱT)H
  2. H and He show heating effect
  3. All gases show change in temperature
  4. Joule-Thomson is iso-enthalpic in nature

Joule-Thomson coefficient is defined as με = (ϱP/ϱT)H

Which enthalpy is forever negative?

  1. Enthalpy of formation
  2. Enthalpy of solution
  3. Enthalpy of combustion
  4. Enthalpy of melting

Enthalpy of combustion

Any property magnitude independent of the amount of substance present is called a/an whose

  1. Intensive property
  2. Colligative property
  3. Structural property
  4. Extensive property

Intensive property

Regarding the internal energy of the molecules, which one of the following statement is not true?

  1. It is the sum of vibrational, rotational and electronic energy
  2. Its absolute value cannot be determined
  3. It is a state function
  4. It is a path function

It is a path function

When two bodies have equality of temperature with a 3rd body, they in turn have equality of temperature with each other. This is a statement of

  1. Zeroth law of thermodynamics
  2. First law of thermodynamics
  3. Second law of thermodynamics
  4. Nernst heat theorem

Zeroth law of thermodynamics

Which statement is not related with entropy?

  1. It is a path function
  2. It is a measure of unavailable energy
  3. It is a function of thermodynamic probability
  4. It is a measure of disorder

It is a path function

If T1 and T₂ are the temperatures of the heat source and sink, respectively. Then efficiency of the heat engine is defined as

  1. T2/T1
  2. T1/T2
  3. 1-T2/T1
  4. 1+ T1/T₂

1-T2/T1

The efficiency of a reversible heat engine depends only on the

  1. Temperature of the heat sink
  2. Temperature of the heat source and sink
  3. Nature of the engine fluid
  4. Temperature of the heat source

Temperature of the heat source and sink

Which statement is not true with respect, to second law of thermodynamics?

  1. It is based on Nernst heat theorem
  2. It helps to know the position of chemical equilibrium
  3. It determines the conversion of heat into work
  4. It helps in determining the direction of energy transfer

It is based on Nernst heat theorem

The overall energy change during the Carnot cycle is

  1. Maximum
  2. Equal to Q
  3. Equal to W
  4. Equal to zero

Equal to zero

Which process is not related with Carnot cycle?

  1. Isobaric compression
  2. Adiabatic expansion
  3. Isothermal compression
  4. Isothermal expansion

Isobaric compression

Which expression is true regarding entropy change of a reversible process?

  1. ΔS > 0
  2. ΔS = 1
  3. ΔS < 0
  4. ΔS = 0

ΔS = 0

Which is not a state function?

  1. Heat
  2. Pressure
  3. Temperature
  4. Volume

Heat

Which is true regarding the entropy of the universe?

  1. Tend towards a minimum
  2. Tends towards a maximum
  3. Tends to be zero
  4. Remains constant

Tends towards a maximum

Which causes decreases in entropy?

  1. Conversion of ice into water
  2. Rusting of iron
  3. Vaporization of camphor
  4. Precipitation of sucrose from water

Precipitation of sucrose from water

The condensation of any gas to a liquid is expected to have _____ and a _______.

  1. A negative AH and a negative AS
  2. A positive AH and a negative AS
  3. A negative AH and a positive AS
  4. A positive AH and a positive AS

A negative AH and a negative AS

Total kinetic energy of a molecule of a gas is due to

  1. Translational motion
  2. Rotational motion
  3. Vibrational motion
  4. All of A, B, and C

All of A, B, and C

At constant T and P, the change in Gibbs free energy is represented by which of the following?

  1. ΔF = ΔH – TΔS
  2. ΔF = ΔA + TΔS
  3. ΔF = ΔA – TΔS
  4. ΔF = ΔH + TΔS

ΔF = ΔH – TΔS

Which does not represents the criterion of spontaneity of a reaction?

  1. ΔS ≤ 0 (at constant V and E)
  2. ΔH ≤ 0 (at constant S and P)
  3. ΔE ≤ 0 (at constant S and V)
  4. ΔF ≤ 0 (at constant T and P)

ΔS ≤ 0 (at constant V and E)

At constant temperature, the decrease in Helmholtz free energy is equal to which of the following?

  1. Decrease in entropy
  2. Increase in entropy
  3. Irreversible work done by the system
  4. Maximum work done by the system

Maximum work done by the system

At constant temperature and pressure, the decrease in Gibbs free energy (F) is equal to

  1. All types of work except the work of expansion
  2. Maximum work done by the system
  3. Decrease in entropy
  4. Increase in entropy

All types of work except the work of expansion

Enthalpy of food and fuel is measured by

  1. Monometer
  2. Bomb calorimeter
  3. Colorimeter
  4. Refractometer

Bomb calorimeter

All naturally occurring processes proceed spontaneously in a direction leads to

  1. Decrease in free energy
  2. Increase in internal energy
  3. Decrease of entropy
  4. Increase in temperature

Decrease in free energy

In the bomb calorimeter, the reaction is carried out at which of the following?

  1. Constant P
  2. Constant V
  3. Constant Q
  4. Constant T

Constant V

Which law of thermodynamics helps in a calculating the absolute entropies of varies substances?

  1. Zeroth law
  2. Third law
  3. Second law
  4. 1st law

Third law

0Which expression describes the exact relationship between standard free energy change and equilibrium constant?

  1. ΔF = RT in K
  2. ΔF = RT in K
  3. ΔF = ΔH – TAS
  4. ΔF = nRT in P2/P1

ΔF = RT in K

Which is the statement of third law of thermodynamics?

  1. Entropy of a perfectly crystalline substance is zero at STP
  2. Entropy of perfectly crystalline substance is zero at T = 0
  3. Entropy and enthalpy of a substance become equal at T=0
  4. Free energy of a crystalline substance is zero at T=0

Entropy of perfectly crystalline substance is zero at T = 0

If n1 and n2 represent moles of two components and µ1 and µ₂ their chemical potentials, respectively, then Gibbs-Duhem equation for this binary system is written as

  1. n1dµ1 = n2dµ₂ = 0
  2. n1dµ1 – n2dµ₂ = 0
  3. n1dµ1 + n2dµ₂ > 0
  4. n1dµ1 + n2dµ₂ = 0

n1dµ1 + n2dµ₂ = 0

According to which law, the enthalpy change accompanying any physical or chemical transformation approaches zero as T approaches zero.

  1. Nernst heat theorem
  2. Third law of thermodynamics
  3. Second law of thermodynamics
  4. Helmholtz law

Nernst heat theorem

Which statements false regarding process of evaporation of a liquid?

  1. No change in free energy
  2. Free energy decreases
  3. Entropy increases
  4. Enthalpy increases

No change in free energy

The link between classical thermodynamic and quantum mechanics is provided by which of the following law?

  1. Matrix mechanics
  2. Boltzmann law
  3. Wave mechanics
  4. Statistical mechanics

Statistical mechanics

What is the enthalpy of an element in standard state?

  1. 298 kJ/mole
  2. 9 kJ/mole
  3. Zero
  4. None of A, B, and C

Zero

In statistical mechanics, there exists a function which contains all the information about a macroscopic system. This function is called _____ .

  1. Partition function
  2. Distribution function
  3. Eigen function
  4. Wave function

Partition function

Which has the highest value?

  1. Electronic partition function
  2. Rotational partition function
  3. Vibrational partition function
  4. Translational partition function

Translational partition function

In an adiabatic system, if work is done, the temperature must be _____.

  1. Decrease
  2. Increase
  3. Remain the same
  4. None of A, B, and C

Decrease

In which substance(s) ΔE = ΔH and no PV work?

  1. Gases
  2. Liquids
  3. Both liquids and solids
  4. Solids only

Both liquids and solids

The heat flow of a system under isochoric conditions is a direct measurement of which of the following?

  1. ΔE
  2. Work
  3. ΔH
  4. ΔF

ΔE

According to Le-Chatelir’s principle, the addition of heat to the following reactions CO2 + 2H2O →  CH4 +2O2 will cause it to shift to right. The reaction can therefore be described as

  1. Spontaneous
  2. Endothermic
  3. Exothermic
  4. Adiabatic

Endothermic

For the reaction given below: CaCO3 → CaO + CO2. When taking place at higher temperature, Which is true?

  1. ΔH < 0, ΔF ≥ 0
  2. ΔS > 0, ΔF < 0
  3. ΔH ≤ 0, ΔF < 0
  4. ΔF ≥ 0, ΔA ≥ 0

ΔS > 0, ΔF < 0

At constant volume the heat of a reaction is represented by

  1. ΔE
  2. ΔH
  3. ΔA
  4. ΔF

ΔE

Which is true for adiabatic reversible process?

  1. ΔQ = 0
  2. ΔP = 0
  3. ΔW = 0
  4. ΔT = 0

ΔQ = 0

______ is the thermodynamic parameter, which is a state function and is measure of disorder of a system.

  1. Internal energy
  2. Enthalpy
  3. Free energy
  4. Entropy

Entropy

One calorie is equivalent to

  1. 8.314 J
  2. 41.84 J
  3. 4.184 J
  4. 83.14 J

4.184 J

The statement that heat cannot flow spontaneously from a colder to a hotter body is the result of which of the following?

  1. The first law of thermodynamics
  2. Henry’s law
  3. The third law of thermodynamics.
  4. The second law of thermodynamics

The second law of thermodynamics

Internal energy of a given mass of an ideal gas depends upon

  1. Volume
  2. Pressure
  3. Temperature
  4. All of A, B, and C

Temperature

Which provides physical significance of ΔF?

  1. -ΔF Wuseful
  2. ΔF = Wmax
  3. ΔF = Wuseful
  4. ΔF = ΔH-TΔS

-ΔF Wuseful

For an spontaneous be endothermic process

  1. ΔS must be greater than zero
  2. ΔF must be positive
  3. TΔS must be negative
  4. All of A, B, and C

ΔS must be greater than zero

Use of thermometer is based on which law of thermodynamics?

  1. Zeroth law
  2. 1st law
  3. 2nd Law
  4. 3rd law

Zeroth law

ΔG = ΔG°, when the reaction quotient (Q) is

  1. 1
  2. <1
  3. >1
  4. 0

1

For a reversible process, what is the entropy change?

  1. ΔS > 0
  2. ΔS < 0
  3. ΔS = 0
  4. All of A, B, and C

ΔS = 0

At equilibrium the free energy change is

  1. ΔG > 0
  2. ΔG < 0
  3. ΔG = 0
  4. All of A, B, and C

ΔG = 0

Which is true for first law of thermodynamics?

  1. ΔE =Q + PV
  2. ΔE =Q + W
  3. ΔE = Q – W
  4. ΔE = Q – PV

ΔE =Q + W

If ΔG is zero for a reaction then _____.

  1. ΔH = 0
  2. ΔS = 0
  3. K = 1
  4. K= 0

K = 1

Which occurs when a solid melts?

  1. Decrease in free energy
  2. Increase in internal energy
  3. Decrease in internal energy
  4. Decrease in entropy

Decrease in free energy

Which makes the motion of perpetual motion machine a physical impossibility?

  1. Zeroth law of thermodynamics
  2. Second law of thermodynamics
  3. Third law of thermodynamics
  4. First law of thermodynamics

First law of thermodynamics

More Physical Chemistry MCQs

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  2. CHEMICAL AND IONIC EQUILIBRIA MCQs
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  4. CHEMICAL THERMODYNAMICS MCQs
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