CHEMICAL THERMODYNAMICS MCQs
Which is not an intensive property?
- Entropy
- Refractive index
- Specific gravity
- Melting point
Entropy
is the branch of chemistry that deals with the basic principles governing energy changes during numerous processes/
- Wave mechanics
- Chemical thermodynamics
- Chemical kinetics
- Electrochemistry
Chemical thermodynamics
________ system is a system which can exchange energy as well as matter with its surroundings.
- Open system
- Inert system
- Closed system
- Isolated system
Open system
A closed system is one which can exchange with surroundings
- Matter but not energy
- Neither matter nor energy
- Both matter and energy
- Energy but not matter
Energy but not matter
Which is not an extensive property?
- Free energy
- Entropy
- Work
- Volume
Work
∆H and ∆E are related as.
- ∆E = ∆H+ ∆PV
- ∆E = ∆H – P∆F
- ∆H = ∆E+ P∆V
- ∆H = ∆E-P∆S
∆H = ∆E+ P∆V
In an isochoric process
- Volume remains constant
- Pressure remains constant
- Energy remains constant
- Temperature remains constant
Volume remains constant
Which is forever true for the adiabatic expansion of a gas?
- Temperature rises
- Pressure rises
- Q = 0
- W = 0
Q = 0
A process in which no heat/mass enters or leaves the system is called
- Adiabatic
- Isochoric
- Isobaric
- Isothermal
Adiabatic
The variation of enthalpy of reaction with temperature is given by
- Kirchhoff’s equation
- Classius-Clapayron equation
- Hesse’s law
- Arrhenius equation
Kirchhoff’s equation
Internal energy does not include which of the following?
- Nuclear energy
- Vibrational energy
- Rotational energy
- Energy of gravitational pull
Energy of gravitational pull
Which statements is not related to applications and limitations of first law of thermodynamics?
- It is silent about the direction of heat
- It is silent about the source of heat
- This law explains why chemical reactions proceed to completion
- 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?
- Joule-Thomson coefficient is defined as με = (ϱP/ϱT)H
- H and He show heating effect
- All gases show change in temperature
- Joule-Thomson is iso-enthalpic in nature
Joule-Thomson coefficient is defined as με = (ϱP/ϱT)H
Which enthalpy is forever negative?
- Enthalpy of formation
- Enthalpy of solution
- Enthalpy of combustion
- Enthalpy of melting
Enthalpy of combustion
Any property magnitude independent of the amount of substance present is called a/an whose
- Intensive property
- Colligative property
- Structural property
- Extensive property
Intensive property
Regarding the internal energy of the molecules, which one of the following statement is not true?
- It is the sum of vibrational, rotational and electronic energy
- Its absolute value cannot be determined
- It is a state function
- 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
- Zeroth law of thermodynamics
- First law of thermodynamics
- Second law of thermodynamics
- Nernst heat theorem
Zeroth law of thermodynamics
Which statement is not related with entropy?
- It is a path function
- It is a measure of unavailable energy
- It is a function of thermodynamic probability
- It is a measure of disorder
It is a path function
If T1 and Tâ‚‚ are the temperatures of the heat source and sink, respectively. Then efficiency of the heat engine is defined as
- T2/T1
- T1/T2
- 1-T2/T1
- 1+ T1/Tâ‚‚
1-T2/T1
The efficiency of a reversible heat engine depends only on the
- Temperature of the heat sink
- Temperature of the heat source and sink
- Nature of the engine fluid
- Temperature of the heat source
Temperature of the heat source and sink
Which statement is not true with respect, to second law of thermodynamics?
- It is based on Nernst heat theorem
- It helps to know the position of chemical equilibrium
- It determines the conversion of heat into work
- 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
- Maximum
- Equal to Q
- Equal to W
- Equal to zero
Equal to zero
Which process is not related with Carnot cycle?
- Isobaric compression
- Adiabatic expansion
- Isothermal compression
- Isothermal expansion
Isobaric compression
Which expression is true regarding entropy change of a reversible process?
- ΔS > 0
- ΔS = 1
- ΔS < 0
- ΔS = 0
ΔS = 0
Which is not a state function?
- Heat
- Pressure
- Temperature
- Volume
Heat
Which is true regarding the entropy of the universe?
- Tend towards a minimum
- Tends towards a maximum
- Tends to be zero
- Remains constant
Tends towards a maximum
Which causes decreases in entropy?
- Conversion of ice into water
- Rusting of iron
- Vaporization of camphor
- Precipitation of sucrose from water
Precipitation of sucrose from water
The condensation of any gas to a liquid is expected to have _____ and a _______.
- A negative AH and a negative AS
- A positive AH and a negative AS
- A negative AH and a positive AS
- 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
- Translational motion
- Rotational motion
- Vibrational motion
- 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?
- ΔF = ΔH – TΔS
- ΔF = ΔA + TΔS
- ΔF = ΔA – TΔS
- ΔF = ΔH + TΔS
ΔF = ΔH – TΔS
Which does not represents the criterion of spontaneity of a reaction?
- ΔS ≤ 0 (at constant V and E)
- ΔH ≤ 0 (at constant S and P)
- ΔE ≤ 0 (at constant S and V)
- 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?
- Decrease in entropy
- Increase in entropy
- Irreversible work done by the system
- 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
- All types of work except the work of expansion
- Maximum work done by the system
- Decrease in entropy
- Increase in entropy
All types of work except the work of expansion
Enthalpy of food and fuel is measured by
- Monometer
- Bomb calorimeter
- Colorimeter
- Refractometer
Bomb calorimeter
All naturally occurring processes proceed spontaneously in a direction leads to
- Decrease in free energy
- Increase in internal energy
- Decrease of entropy
- Increase in temperature
Decrease in free energy
In the bomb calorimeter, the reaction is carried out at which of the following?
- Constant P
- Constant V
- Constant Q
- Constant T
Constant V
Which law of thermodynamics helps in a calculating the absolute entropies of varies substances?
- Zeroth law
- Third law
- Second law
- 1st law
Third law
0Which expression describes the exact relationship between standard free energy change and equilibrium constant?
- ΔF = RT in K
- ΔF = RT in K
- ΔF = ΔH – TAS
- ΔF = nRT in P2/P1
ΔF = RT in K
Which is the statement of third law of thermodynamics?
- Entropy of a perfectly crystalline substance is zero at STP
- Entropy of perfectly crystalline substance is zero at T = 0
- Entropy and enthalpy of a substance become equal at T=0
- 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
- n1dµ1 = n2dµ₂ = 0
- n1dµ1 – n2dµ₂ = 0
- n1dµ1 + n2dµ₂ > 0
- 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.
- Nernst heat theorem
- Third law of thermodynamics
- Second law of thermodynamics
- Helmholtz law
Nernst heat theorem
Which statements false regarding process of evaporation of a liquid?
- No change in free energy
- Free energy decreases
- Entropy increases
- Enthalpy increases
No change in free energy
The link between classical thermodynamic and quantum mechanics is provided by which of the following law?
- Matrix mechanics
- Boltzmann law
- Wave mechanics
- Statistical mechanics
Statistical mechanics
What is the enthalpy of an element in standard state?
- 298 kJ/mole
- 9 kJ/mole
- Zero
- 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 _____ .
- Partition function
- Distribution function
- Eigen function
- Wave function
Partition function
Which has the highest value?
- Electronic partition function
- Rotational partition function
- Vibrational partition function
- Translational partition function
Translational partition function
In an adiabatic system, if work is done, the temperature must be _____.
- Decrease
- Increase
- Remain the same
- None of A, B, and C
Decrease
In which substance(s) ΔE = ΔH and no PV work?
- Gases
- Liquids
- Both liquids and solids
- Solids only
Both liquids and solids
The heat flow of a system under isochoric conditions is a direct measurement of which of the following?
- ΔE
- Work
- ΔH
- 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
- Spontaneous
- Endothermic
- Exothermic
- Adiabatic
Endothermic
For the reaction given below: CaCO3 → CaO + CO2. When taking place at higher temperature, Which is true?
- ΔH < 0, ΔF ≥ 0
- ΔS > 0, ΔF < 0
- ΔH ≤ 0, ΔF < 0
- ΔF ≥ 0, ΔA ≥ 0
ΔS > 0, ΔF < 0
At constant volume the heat of a reaction is represented by
- ΔE
- ΔH
- ΔA
- ΔF
ΔE
Which is true for adiabatic reversible process?
- ΔQ = 0
- ΔP = 0
- ΔW = 0
- ΔT = 0
ΔQ = 0
______ is the thermodynamic parameter, which is a state function and is measure of disorder of a system.
- Internal energy
- Enthalpy
- Free energy
- Entropy
Entropy
One calorie is equivalent to
- 8.314 J
- 41.84 J
- 4.184 J
- 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?
- The first law of thermodynamics
- Henry’s law
- The third law of thermodynamics.
- The second law of thermodynamics
The second law of thermodynamics
Internal energy of a given mass of an ideal gas depends upon
- Volume
- Pressure
- Temperature
- All of A, B, and C
Temperature
Which provides physical significance of ΔF?
- -ΔF Wuseful
- ΔF = Wmax
- ΔF = Wuseful
- ΔF = ΔH-TΔS
-ΔF Wuseful
For an spontaneous be endothermic process
- ΔS must be greater than zero
- ΔF must be positive
- TΔS must be negative
- All of A, B, and C
ΔS must be greater than zero
Use of thermometer is based on which law of thermodynamics?
- Zeroth law
- 1st law
- 2nd Law
- 3rd law
Zeroth law
ΔG = ΔG°, when the reaction quotient (Q) is
- 1
- <1
- >1
- 0
1
For a reversible process, what is the entropy change?
- ΔS > 0
- ΔS < 0
- ΔS = 0
- All of A, B, and C
ΔS = 0
At equilibrium the free energy change is
- ΔG > 0
- ΔG < 0
- ΔG = 0
- All of A, B, and C
ΔG = 0
Which is true for first law of thermodynamics?
- ΔE =Q + PV
- ΔE =Q + W
- ΔE = Q – W
- ΔE = Q – PV
ΔE =Q + W
If ΔG is zero for a reaction then _____.
- ΔH = 0
- ΔS = 0
- K = 1
- K= 0
K = 1
Which occurs when a solid melts?
- Decrease in free energy
- Increase in internal energy
- Decrease in internal energy
- Decrease in entropy
Decrease in free energy
Which makes the motion of perpetual motion machine a physical impossibility?
- Zeroth law of thermodynamics
- Second law of thermodynamics
- Third law of thermodynamics
- First law of thermodynamics
First law of thermodynamics
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