Thermodynamics PYQs - Last 10 Years
AP EAPCET / Chemistry / Physical Chemistry / 58 recent questions
ChemistryPhysical Chemistry2016-2025
Practice 58 AP EAPCET Chemistry questions from Thermodynamics. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.
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Last 10 Years Thermodynamics Questions
Showing 50 of 58 filtered questions.
1Thermodynamics
5 moles of a gas is allowed to pass through a series of changes as shown in the graph, in a cyclic process. The processes $C \rightarrow A, B \rightarrow C$ and $A \rightarrow B$ respectively are
MCQ+1 / -02025
2Thermodynamics
1 mole of an ideal gas is allowed to expand isothermally and reversibly from $\mathrm{1L}$ to 5 L at 300 K . The change in enthalpy (in kJ ) is $\left(R=8.3 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}\right)$
MCQ+1 / -02025
3Thermodynamics
Consider the following.
Statement -I Both internal energy $(U)$ and work $(W)$ are state functions.
Statement-II During the free expansion of an ideal gas into vacuum, the work done is zero.
The correct answer is
Statement -I Both internal energy $(U)$ and work $(W)$ are state functions.
Statement-II During the free expansion of an ideal gas into vacuum, the work done is zero.
The correct answer is
MCQ+1 / -02025
4Thermodynamics
The signs of $\Delta_r H^{\circ}$ and $\Delta_r S^{\circ}$ for a reaction to be spontaneous at all temperature respectively are
MCQ+1 / -02025
5Thermodynamics
The number of extensive and intensive properties in the list given below is respectively, density, enthalpy, mass, temperature, volume, pressure
MCQ+1 / -02025
6Thermodynamics
One mole of ethanol ( $l$ ) was completely burnt in oxygen to form $\mathrm{CO}_2(\mathrm{~g})$ and $\mathrm{H}_2 \mathrm{O}(l)$. What is the $\Delta_r H^{\circ}$ (in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) for this reaction?
(The standard enthal...
(The standard enthal...
MCQ+1 / -02025
7Thermodynamics
The $\mathrm{C}_p$ of $\mathrm{H}_2 \mathrm{O}(l)$ is $75.3 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$. What is the energy (in J ) required to raise 180 g of liquid water from $10^{\circ} \mathrm{C}$ to $15^{\circ} \mathrm{C}$ ? $\lef...
MCQ+1 / -02025
8Thermodynamics
If $\Delta_r H^{\ominus}$ and $\Delta_r S^{\ominus}$ are standard enthalpy change and standard entropy change respectively for a reaction, the incorrect option is
MCQ+1 / -02025
9Thermodynamics
At $298 \mathrm{~K}, \Delta_r U^{\ominus}$ and $\Delta_r S^{\ominus}$ for the following reaction are -10.5 kJ and $+44.1 \mathrm{JK}^{-1} ; 2 X(\mathrm{~g})+Y(\mathrm{~g}) \longrightarrow 2 Z(\mathrm{~g})$ What is $\Delta_r G^{\ominus}$ (in...
MCQ+1 / -02025
10Thermodynamics
For which reaction $\Delta H \neq \Delta U ?$
MCQ+1 / -02025
11Thermodynamics
Enthalpy of formation of $\mathrm{CO}_2(\mathrm{~g}), \mathrm{H}_2 \mathrm{O}(\mathrm{l})$ and $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6(\mathrm{~s})$ are $-393,-286$ and $-1170 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively. The quantity o...
MCQ+1 / -02025
12Thermodynamics
Identify the incorrect statements from the following.
I. For adiabatic process, $\Delta U=w_{\text {ad }}$
II. Enthalpy is an intensive property
III. For the process, $\mathrm{H}_2 \mathrm{O}(l) \rightarrow \mathrm{H}_2 \mathrm{O}(s)$, the ...
I. For adiabatic process, $\Delta U=w_{\text {ad }}$
II. Enthalpy is an intensive property
III. For the process, $\mathrm{H}_2 \mathrm{O}(l) \rightarrow \mathrm{H}_2 \mathrm{O}(s)$, the ...
MCQ+1 / -02025
13Thermodynamics
Identify the correct statements from the following.
I. Work is a path function.
II. Enthalpy is an extensive property.
III. Lattice enthalpy of ionic compounds can be obtained from Born-Haber cycle.
I. Work is a path function.
II. Enthalpy is an extensive property.
III. Lattice enthalpy of ionic compounds can be obtained from Born-Haber cycle.
MCQ+1 / -02025
14Thermodynamics
Which of the following processes entropy change $(\Delta S)$ is negative?
I. Sublimation of dry ice
II. Freezing of water
III. Crystallisation of the dissolved substance
IV. Burning of rocket fuel
I. Sublimation of dry ice
II. Freezing of water
III. Crystallisation of the dissolved substance
IV. Burning of rocket fuel
MCQ+1 / -02025
15Thermodynamics
One mole of $\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}(l)$ was completely burnt in oxygen to form $\mathrm{CO}_2(g)$ and $\mathrm{H}_2 \mathrm{O}(l)$. The standard enthalpy of formation $\left(\Delta_f H^{\ominus}\right)$ of $\mathrm{C}_2 \math...
MCQ+1 / -02025
16Thermodynamics
Consider the following reaction
\(A(g)+3 B(g) \longrightarrow 2 C(g) ; \Delta H^{\ominus}=-24 \mathrm{~kJ}\)
At $25^{\circ} \mathrm{C}$, if $\Delta G^{\ominus}$ of the reaction is -9 kJ , the standard entropy change (in $\mathrm{JK}^{-1}$...
\(A(g)+3 B(g) \longrightarrow 2 C(g) ; \Delta H^{\ominus}=-24 \mathrm{~kJ}\)
At $25^{\circ} \mathrm{C}$, if $\Delta G^{\ominus}$ of the reaction is -9 kJ , the standard entropy change (in $\mathrm{JK}^{-1}$...
MCQ+1 / -02025
17Thermodynamics
The energy required to increase the temperature of 180 g of liquid water from $10^{\circ} \mathrm{C}$ to $15^{\circ} \mathrm{C}$ is 3765 J . What is $C_p$ of water in $\mathrm{J} \mathrm{mol}^{-1} \mathrm{~K}^{-1} ?\left(\mathrm{H}_2 \mathr...
MCQ+1 / -02025
18Thermodynamics
Consider the following :
Statement I : During isothermal expansion of an ideal gas its enthalpy decreases.
Statement II : When 2.0 L of an ideal gas expands isothermally into vaccum, $\Delta U=0$.
The correct answer is :
Statement I : During isothermal expansion of an ideal gas its enthalpy decreases.
Statement II : When 2.0 L of an ideal gas expands isothermally into vaccum, $\Delta U=0$.
The correct answer is :
MCQ+1 / -02025
19Thermodynamics
At 273 K the maximum work done when pressure on 10 g of hydrogen is reduced from 10 atm to 1 atm under isothermal, reversible conditions is
(Assume the gas behaves ideally)
\(\left(R=83 \mathrm{Jk}^{-1} \mathrm{~mol}^{-1}\right)\)
(Assume the gas behaves ideally)
\(\left(R=83 \mathrm{Jk}^{-1} \mathrm{~mol}^{-1}\right)\)
MCQ+1 / -02025
20Thermodynamics
Observe the following reactions.
I. $\mathrm{CaCO}_3(\mathrm{~s}) \longrightarrow \mathrm{CaO}(\mathrm{s})+\mathrm{CO}_2(\mathrm{~g})$
II. $\mathrm{Cl}_2(\mathrm{~g}) \longrightarrow 2 \mathrm{Cl}(\mathrm{g})$
III. $\mathrm{H}_2 \mathrm{O}(...
I. $\mathrm{CaCO}_3(\mathrm{~s}) \longrightarrow \mathrm{CaO}(\mathrm{s})+\mathrm{CO}_2(\mathrm{~g})$
II. $\mathrm{Cl}_2(\mathrm{~g}) \longrightarrow 2 \mathrm{Cl}(\mathrm{g})$
III. $\mathrm{H}_2 \mathrm{O}(...
MCQ+1 / -02024
21Thermodynamics
$A, B, C$ and $D$ are some compounds. The entnalpy of formation of $A(g), B(g), C(g)$ and $D(g)$ is $9.7,-110,81$ and $-393 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively. What is $\Delta_r H$
(in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) for the gi...
(in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) for the gi...
MCQ+1 / -02024
22Thermodynamics
What is the enthalpy change (in J ) for converting 98 of $\mathrm{H}_2 \mathrm{O}(t)+10^{\circ} \mathrm{C}$ to $\mathrm{H}_2 \mathrm{O}(l)$ at $+20^{\circ} \mathrm{C}$ ?
$$ \left(C_p\left(\mathrm{H}_2 \mathrm{O}(\eta)\right)=75 \mathrm{Jmol...
$$ \left(C_p\left(\mathrm{H}_2 \mathrm{O}(\eta)\right)=75 \mathrm{Jmol...
MCQ+1 / -02024
23Thermodynamics
Two statements are given below.
Statement I : The reaction $\mathrm{Cr}_2 \mathrm{O}_3+2 \mathrm{Al} \longrightarrow \mathrm{Al}_2 \mathrm{O}_3+2 \mathrm{Cr}$ $\left(\Delta G^{\ominus}=-421 \mathrm{~kJ}\right)$ is thermodynamically feasible...
Statement I : The reaction $\mathrm{Cr}_2 \mathrm{O}_3+2 \mathrm{Al} \longrightarrow \mathrm{Al}_2 \mathrm{O}_3+2 \mathrm{Cr}$ $\left(\Delta G^{\ominus}=-421 \mathrm{~kJ}\right)$ is thermodynamically feasible...
MCQ+1 / -02024
24Thermodynamics
Observe the following reaction.
\(A B \mathrm{O}_3(\mathrm{~s}) \xrightarrow{1000 \mathrm{~K}} A \mathrm{O}(\mathrm{~s})+B \mathrm{O}_2(\mathrm{~g})\)
$\Delta_r H$ for this reaction is $x \mathrm{~kJ} \mathrm{~mol}^{-1}$. What is its $\...
MCQ+1 / -02024
25Thermodynamics
At $300 \mathrm{~K}, \Delta_r G^{\Theta}$ for the reaction $A_2(g) \rightleftharpoons B_2(g)$ is $-11.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The Equilibrium constant at 300 K is approximately ( $R=8314 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K...
MCQ+1 / -02024
26Thermodynamics
Identify the correct statements from the following.
I. $\Delta_r G$ is zero for $A \rightleftharpoons B$ reaction.
II. The entropy of pure crystalline solids approaches. zero as the temperature approaches absolute zero.
III. $\Delta U$ of a...
I. $\Delta_r G$ is zero for $A \rightleftharpoons B$ reaction.
II. The entropy of pure crystalline solids approaches. zero as the temperature approaches absolute zero.
III. $\Delta U$ of a...
MCQ+1 / -02024
27Thermodynamics
Observe the following reactions.
$$ \begin{array}{ll} A B(g)+25 \mathrm{H}_2 \mathrm{O}(l) \longrightarrow\left(25 \mathrm{H}_2 \mathrm{O}\right) A B ; & \Delta H=x \mathrm{~kJ} \mathrm{~mol}^{-1} \\ A B(g)+50 \mathrm{H}_2 \mathrm{O}(l) \lo...
$$ \begin{array}{ll} A B(g)+25 \mathrm{H}_2 \mathrm{O}(l) \longrightarrow\left(25 \mathrm{H}_2 \mathrm{O}\right) A B ; & \Delta H=x \mathrm{~kJ} \mathrm{~mol}^{-1} \\ A B(g)+50 \mathrm{H}_2 \mathrm{O}(l) \lo...
MCQ+1 / -02024
28Thermodynamics
The equation that represents 'coal gasification' is
MCQ+1 / -02024
29Thermodynamics
The standard free energy change $\left(\Delta G^{\circ}\right)$ for the following reaction (in kJ ) at $25^{\circ} \mathrm{C}$ is
$$
3 \mathrm{Ca}(s)+2 \mathrm{Au}^{3+}(a q, 1 M) \longrightarrow 3 \mathrm{Ca}^{2+}(a q, 1 M)+2 \mathrm{Au}(...
$$
3 \mathrm{Ca}(s)+2 \mathrm{Au}^{3+}(a q, 1 M) \longrightarrow 3 \mathrm{Ca}^{2+}(a q, 1 M)+2 \mathrm{Au}(...
MCQ+1 / -02024
30Thermodynamics
The number of extensive properties in the following list is enthalpy, density, volume, internal energy, temperature.
MCQ+1 / -02024
31Thermodynamics
Identify the correct equation relating $\Delta H, \Delta U$ and $\Delta T$ for 1 mole of an ideal gas from the following. ( $R=$ gas constant)
MCQ+1 / -02024
32Thermodynamics
Identify the molecule for which the enthalpy of atomisation ( $\Delta_a H^{\ominus}$ ) and bond dissociation enthalpy $\left(\Delta_{\text {bond }} H^{\ominus}\right)$ are not equal
MCQ+1 / -02024
33Thermodynamics
Observe the following reaction,
\(2 A_2(g)+B_2(g) \xrightarrow{T(\mathrm{~K})} 2 A_2 B(g)+600 \mathrm{~kJ}\)
The standard enthalpy of formation $\left(\Delta_f H^{\ominus}\right)$ of $A_2 B(g)$ is
\(2 A_2(g)+B_2(g) \xrightarrow{T(\mathrm{~K})} 2 A_2 B(g)+600 \mathrm{~kJ}\)
The standard enthalpy of formation $\left(\Delta_f H^{\ominus}\right)$ of $A_2 B(g)$ is
MCQ+1 / -02024
34Thermodynamics
The molar heat of fusion and vaporisation of benzene are 10.9 and $31.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively. The changes in entropy for the solid $\rightarrow$ liquid and liquid $\rightarrow$ vapour trasitions for benzene are $x$ ...
MCQ+1 / -02024
35Thermodynamics
The volume of an ideal gas contracts from 10.0 L to 2.0 L under an applied pressure of 2.0 atm . During contraction the system also evolved 900 J of heat. The change in internal energy (in J ) involved in the system is ( $1 \mathrm{~L} \mat...
MCQ+1 / -02024
36Thermodynamics
What is the ratio of kinetic energies of 3 g of hydrogen and 4 g of oxygen at a certain temperature?
MCQ+1 / -02024
37Thermodynamics
A thermodynamic process $(B \rightarrow E)$ was completed as shown below. The work done is equal to area under the limits
MCQ+1 / -02024
38Thermodynamics
Given below are two statements :
Statement I For isothermal irreversible change of an ideal gas, $q=-w=p_{\text {ext }}\left(V_{\text {final }}-V_{\text {initial }}\right)$
Statement II For adiabatic change, $\Delta U=w_{\text {adiabatic }}...
Statement I For isothermal irreversible change of an ideal gas, $q=-w=p_{\text {ext }}\left(V_{\text {final }}-V_{\text {initial }}\right)$
Statement II For adiabatic change, $\Delta U=w_{\text {adiabatic }}...
MCQ+1 / -02024
39Thermodynamics
Identify the incorrect statements form the following.I. $ \Delta S_{\text {pum }}=\left(\Delta S_{\text {nal }}+\Delta S_{\text {um }}\right) $II. $A(\bar{i} \rightarrow A(\phi)$ : For this process entropy change decreases.III. Entropy unit...
MCQ+1 / -02024
40Thermodynamics
At 300 K for the reaction. $A \rightarrow P$. The $\Delta S_p$ is $5 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$, What is the heat absorbed (in kJ $\mathrm{mol}^{-1}$ ) by the system?
MCQ+1 / -02024
41Thermodynamics
If the standard enthalpy change $\left(\Delta_r H^{\circ}\right)$ for reaction $\mathrm{H}_2(\mathrm{~g})+\mathrm{Br}_2(l) \longrightarrow 2 \mathrm{HBr}(\mathrm{g})$ is -72.8 kJ , the standard enthalpy of formation $\left(\Delta_f H^{\circ...
MCQ+1 / -02023
42Thermodynamics
If the standard enthalpy change $\left(\Delta_r H^{-}\right)$for a certain reaction at 298 K and constant pressure $-1860 \mathrm{~kJ} \mathrm{~mol}^{-1}$, the standard entropy change $\left(\Delta_{\text {sys }} \Omega^{\circ}\right)$ of t...
MCQ+1 / -02023
43Thermodynamics
At 300 K the enthalpy change for the following reaction is $-2800 \mathrm{~kJ} \mathrm{~mol}^{-1}$.
\(\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6(s)+6 \mathrm{O}_2(g) \longrightarrow 6 \mathrm{CO}_2(g)+6 \mathrm{H}_2 \mathrm{O}(l)\)
What is...
\(\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6(s)+6 \mathrm{O}_2(g) \longrightarrow 6 \mathrm{CO}_2(g)+6 \mathrm{H}_2 \mathrm{O}(l)\)
What is...
MCQ+1 / -02023
44Thermodynamics
If the work done by 2 mol of an ideal gas during isothermal reversible expansion from 5 L to 50 L is -189.1 L atm at constant pressure, the temperature of the gas (in ${ }^{\circ} \mathrm{C}$ ) is
MCQ+1 / -02023
45Thermodynamics
Use the data from table to estimate the enthalpy of formation of \(\mathrm{CH}_3 \mathrm{CHO}\).
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MCQ+1 / -02022
46Thermodynamics
Identify the correct statements from the following.
I. At 0 K , the entropy of pure crystalline materials approach zero.
II. Entropy for the process, $$\mathrm{H}_2 \mathrm{O}(\mathrm{l}) \longrightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{g})$...
I. At 0 K , the entropy of pure crystalline materials approach zero.
II. Entropy for the process, $$\mathrm{H}_2 \mathrm{O}(\mathrm{l}) \longrightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{g})$...
MCQ+1 / -02022
47Thermodynamics
State \(1 \rightleftharpoons\) State \(2 \rightleftharpoons\) State 3
$$\left(\begin{array}{l}T=300 \mathrm{~K} \\ p=15 \mathrm{bar} \\ 1 \mathrm{~mol}\end{array}\right)\left(\begin{array}{l}T=300 \mathrm{~K} \\ p=10 \mathrm{bar} \\ 1 \math...
$$\left(\begin{array}{l}T=300 \mathrm{~K} \\ p=15 \mathrm{bar} \\ 1 \mathrm{~mol}\end{array}\right)\left(\begin{array}{l}T=300 \mathrm{~K} \\ p=10 \mathrm{bar} \\ 1 \math...
MCQ+1 / -02022
48Thermodynamics
Identify the reaction/process in which the entropy increases.
MCQ+1 / -02022
49Thermodynamics
From the following plots, find the correct option.
MCQ+1 / -02022
50Thermodynamics
Match the following.
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MCQ+1 / -02022