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Find out the Enthalpy of formation of :
B.E. B.E. B.E.
Latent heat of vaporization of water liquid into water vapor then (heat of formation of liquid water) is
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JEE • CHEMISTRY • THERMODYNAMICS
Thermodynamics practice · Hard
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Showing 1-30 of 92 questions
1
Hard
1 of 92
Analyzing
+4 | -1
Consider following reactions
I:
II:
III:
Select the correct statement
I:
II:
III:
Select the correct statement
View answer and explanation
Correct option: D
All the above are correct statements
Option D is correct because all the given statements are correct based on Hess's Law and the definitions of heat of formation and combustion.
2
Hard
2 of 92
Application
+4 | -1
When of glucose was burnt in a bomb calorimeter, the temperature rose by The heat capacity of the calorimeter system is
View answer and explanation
Correct option: A
Option A () is correct because it is the heat capacity calculated using the heat released by the combustion of glucose and the temperature rise.
3
Hard
3 of 92
Application
+4 | -1
A sample of oxygen gas expands its volume from to against a constant pressure of If the work done during expansion is used to heat of water initially present at its final temperature will be
(Specific heat capacity of water )
(Specific heat capacity of water )
View answer and explanation
Correct option: B
Option B () is correct because it accurately calculates the final temperature of the water after accounting for the work done by the expanding oxygen gas.
4
Hard
4 of 92
Application
+4 | -1
One mole of ice is converted into water at 273 K. The entropies of (S) and (l)are 38.20 and 60.01 J respectively. The enthalpy change for the conversion is:
View answer and explanation
Correct option: B
Option B () is correct because it is the enthalpy change calculated using the formula ∆H=T∆S at equilibrium.
5
Hard
5 of 92
Application
+4 | -1
In the reaction
The enthalpies of formation of and are both negative and are in the ratio The enthalpy of formation of is Calculate the enthalpy of formation of
The enthalpies of formation of and are both negative and are in the ratio The enthalpy of formation of is Calculate the enthalpy of formation of
View answer and explanation
Correct option: D
Option D () is correct because it is calculated using Hess's law and the given enthalpy of reaction and formation of other compounds.
6
Hard
6 of 92
Analyzing
+4 | -1
Calculate the enthalpy of formation of from the following data.
(i)
(ii)
(iii)
(iv)
(v)
(vi)
(vii)
(viii)
(ix)
(i)
(ii)
(iii)
(iv)
(v)
(vi)
(vii)
(viii)
(ix)
View answer and explanation
Correct option: A
Option A (-169.0 kJ) is correct because the enthalpy of formation of I2O5(s) is calculated by combining the given reactions using Hess's Law.
7
Hard
7 of 92
Analyzing
+4 | -1
A solution of of is added to of and the mixture is well shaken. The rise in temperature is noted. The experiment is again performed using of solution and of solution and rise in temperature is again noted. Which of the following is correct?
View answer and explanation
Correct option: D
is 1.5 times as larger as
Option D (T1 is 1.5 times as larger as T2) is correct because the heat released in the first experiment is 1.5 times that of the second experiment.
8
Hard
8 of 92
Understanding
+4 | -1
During complete combustion of one mole of butane, of heat is released. The thermochemical reaction for above change is
View answer and explanation
Correct option: C
The correct answer is C () because it represents the complete combustion of one mole of butane with the correct stoichiometric coefficients and enthalpy change.
9
Hard
9 of 92
Application
+4 | -1
If values of for a process/reaction are respectively. Then find value of . Given: Temp is
View answer and explanation
Correct option: A
11
Option A (11) is correct because it involves calculating the Gibbs free energy change and then using it to find the equilibrium constant, finally calculating the log of the inverse of the equilibrium constant.
10
Hard
10 of 92
Application
+4 | -1
One mole of a liquid () is taken in an adiabatic container and the pressure increases steeply to Then at a constant pressure of volume decrease by . Find .
View answer and explanation
Correct option: A
990 J
Option A (990 J) is correct because it is the enthalpy change calculated from the given pressure and volume changes in the adiabatic container.
11
Hard
11 of 92
Application
+4 | -1
The bond energies of and are respectively. The enthalpy change of the reaction is
View answer and explanation
Correct option: D
Option D (-40 kcal) is correct because the enthalpy change is calculated by subtracting the bond energies of products from the bond energies of reactants.
12
Hard
12 of 92
Analyzing
+4 | -1
Statement-1: Work done (W) by the system during isobaric reversible and irreversible processes from same initial state to same final state is equal.
Statement-2: As the pressure is constant so for both the processes.
Statement-2: As the pressure is constant so for both the processes.
View answer and explanation
Correct option: A
Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1
The correct answer is A because work done in an isobaric process is given by , and since the initial and final states are the same, is the same for both reversible and irreversible processes.
13
Hard
13 of 92
Application
+4 | -1
The enthalpy of fusion of water is 1.435 kcal/mol. The molar entropy change for the melting of ice at 0℃ is:
View answer and explanation
Correct option: A
5.260 cal/(mol K)
Option A (5.260 cal/(mol K)) is correct because it is calculated by dividing the enthalpy of fusion by the temperature in Kelvin.
14
Hard
14 of 92
Application
+4 | -1
Find out the Enthalpy of formation of :
View answer and explanation
Correct option: A
y – 2x
The correct answer is A (y – 2x) because it is derived by manipulating the given equations to find the enthalpy of formation of SO2.
15
Hard
15 of 92
Application
+4 | -1
For silver, . If the temperature of 3 moles of silver is raised from 300 K to 1000 K at 1 atm, pressure, the value of will be close to
View answer and explanation
Correct option: A
62 kJ
Option A (62 kJ) is correct because it involves using Kirchoff's relation to calculate the change in enthalpy by integrating the heat capacity equation over the given temperature range.
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16
Hard
16 of 92
Application
+4 | -1
The dissolution of in a large volume of water is endothermic to the extent of For the reaction, is The heat of solution of anhydrous in large quantity of water will be
View answer and explanation
Correct option: B
The correct answer is B (-19.7 kcal mol⁻¹) because it is calculated by using Hess's law to relate the enthalpy changes of the given reactions.
17
Hard
17 of 92
Application
+4 | -1
of iron reacts with in a closed vessel of fixed volume. Again, same amount of is made to react in an open beaker at . The work done (in cal) in both the cases will be respectively
View answer and explanation
Correct option: D
Option D (0, -600) is correct because in a closed vessel with fixed volume, no work is done, while in an open beaker, work is done due to the change in the number of moles of gas.
18
Hard
18 of 92
Application
+4 | -1
A diatomic gas at pressure , compressed adiabatically to half of its volume, what is the final pressure?
View answer and explanation
Correct option: A
Option A ((2)1.4 P) is correct because it is the final pressure calculated using the adiabatic compression formula.
19
Hard
19 of 92
Application
+4 | -1
For the reaction,
for the reaction at when the pressure of is is
for the reaction at when the pressure of is is
View answer and explanation
Correct option: D
Option D (-343.3 kJ) is correct because it is calculated using the Gibbs free energy equation considering the non-standard conditions with the given pressure of SO3.
20
Hard
20 of 92
Application
+4 | -1
The standard molar entropy of an ideal gas is at and The standard molar entropy of the gas at and 1 bar is
View answer and explanation
Correct option: D
Option D () is correct because it is calculated using the formula for entropy change with temperature at constant pressure.
21
Hard
21 of 92
Application
+4 | -1
Calculate the lattice energy forthe reaction,
From the following data:
;
From the following data:
;
View answer and explanation
Correct option: A
Option A () is correct because it is the calculated lattice energy using the given enthalpy values and applying Hess's law.
22
Hard
22 of 92
Analyzing
+4 | -1
The data below refers to gas phase reaction at constant pressure at
From these data, the enthalpy change for the reaction is
From these data, the enthalpy change for the reaction is
View answer and explanation
Correct option: C
Option C () is correct because the enthalpy change is calculated by subtracting the enthalpy of reaction (a) from reaction (b).
23
Hard
23 of 92
Application
+4 | -1
1 mole of an ideal gas undergoes reversible isothermal expansion from an initial volume to a final volume and does of work. The initial pressure was . Calculate .
View answer and explanation
Correct option: A
Option A () is correct because it is the initial volume calculated using the isothermal reversible work formula and the ideal gas law.
24
Hard
24 of 92
Application
+4 | -1
The enthalpy of atomization of graphite is and the mean bond enthalpy of bond in diamond is The enthalpy of conversion of graphite into diamond is
View answer and explanation
Correct option: B
Option B (+1.8 kJ/mol) is correct because the enthalpy of conversion is calculated by subtracting twice the C-C bond enthalpy in diamond from the enthalpy of atomization of graphite.
25
Hard
25 of 92
Application
+4 | -1
1 mole of gas occupying 3 L volume is expanded against a constant external pressure of 1 atm to a volume of 15 litre. The work done by the system is:
View answer and explanation
Correct option: A
Option A () is correct because the work done is calculated using the formula and converting litre atm to Joules.
26
Hard
26 of 92
Application
+4 | -1
of is
of is
of is
Thus, bond enthalpy in is
of is
of is
Thus, bond enthalpy in is
View answer and explanation
Correct option: B
Option B () is correct because it involves calculating the bond enthalpy of C=S in CS2 using enthalpy of formation and atomization energies.
27
Hard
27 of 92
Application
+4 | -1
The vapour pressure of benzene is at and at . The mean latent heat of evaporation of benzene over this temperature range is
View answer and explanation
Correct option: D
Option D () is correct because it's the result of applying the Clausius-Clapeyron equation using the given vapor pressures and temperatures.
28
Hard
28 of 92
Application
+4 | -1
B.E. B.E. B.E.
Latent heat of vaporization of water liquid into water vapor then (heat of formation of liquid water) is
View answer and explanation
Correct option: C
Option C () is correct because it represents the heat of formation of liquid water considering bond energies and the latent heat of vaporization.
29
Hard
29 of 92
Application
+4 | -1
One mole of an ideal monoatomic gas is heated in a process constant. By what amount heat is absorbed in the process in rise in temperature?
View answer and explanation
Correct option: B
Option B (180 J) is correct because the heat absorbed is calculated using the molar heat capacity for a polytropic process and the given temperature change.
30
Hard
30 of 92
Application
+4 | -1
With what minimum pressure (in ), a given volume of an ideal gas , originally at and pressure can be compressed irreversibly adiabatically in order to raise its temperature to :
View answer and explanation
Correct option: B
Option B () is correct because it's derived from the adiabatic irreversible compression formula considering the given conditions and value.
Revision notes and key takeaways
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Key Takeaways
- ✓ This set contains 92 single-correct-answer MCQs on THERMODYNAMICS.
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