Skip to main content
Back to THERMODYNAMICS

Your Progress

0 / 92 Answered
0
Correct
0
Incorrect
0%
Accuracy
JEE • CHEMISTRY • THERMODYNAMICS

Thermodynamics practice · Hard

Try a question, then open “View answer” to check it. Sign in to submit answers and save progress.

Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

Take a chapter quiz →
Showing 1-30 of 92 questions
1 Hard
1 of 92
Analyzing +4 | -1
Consider following reactions
I:  C(s)+12O2( g)−CO(g),ΔH1=a\ \mathrm{C}(\mathrm{s})+\frac{1}{2} \mathrm{O}_2(\mathrm{~g})-\mathrm{CO}(\mathrm{g}), \Delta \mathrm{H}_1=\mathrm{a}

II: CO(g)+12O2( g)−CO2( g),ΔH2=b\mathrm{CO}(\mathrm{g})+\frac{1}{2} \mathrm{O}_2(\mathrm{~g})-\mathrm{CO}_2(\mathrm{~g}), \Delta \mathrm{H}_2=\mathrm{b}

III: C(s)+CO2( g)−2CO(g);ΔH3=c\mathrm{C}(\mathrm{s})+\mathrm{CO}_2(\mathrm{~g})-2 \mathrm{CO}(\mathrm{g}) ; \Delta \mathrm{H}_3=\mathrm{c}
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 0.18 g0.18 \mathrm{~g} of glucose was burnt in a bomb calorimeter, the temperature rose by 4 K.4 \mathrm{~K}. The heat capacity of the calorimeter system is (ΔCH∘=−2.8×106 J/mol glucose)\left(\Delta_{\mathrm{C}} \text{H}^{\circ}=-2.8\times 10^6 \mathrm{~J} / \mathrm{mol} \text{ glucose}\right)
View answer and explanation
Correct option: A
700 J/K700 \mathrm{~J} / \mathrm{K}
Option A (700 J/K700 \mathrm{~J} / \mathrm{K}) 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 3 L3 \mathrm{~L} to 5 L5 \mathrm{~L} against a constant pressure of 3 atm.3 \mathrm{~atm}. If the work done during expansion is used to heat 10 mol10 \mathrm{~mol} of water initially present at 290 K,290 \mathrm{~K}, its final temperature will be

(Specific heat capacity of water =4.18 JK−1 g−1=4.18 \mathrm{~JK}^{-1} \mathrm{~g}^{-1})
View answer and explanation
Correct option: B
290.8 K290.8 \mathrm{~K}
Option B (290.8 K290.8 \mathrm{~K}) 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   H2O\;{\mathrm{H}_2}\mathrm{O} (S) and   H2O\;{\mathrm{H}_2}\mathrm{O} (l)are 38.20 and 60.01 J mol−1K−1\mathrm{mo}{\mathrm{l}^{ - 1}}{\mathrm{K}^{ - 1}} respectively. The enthalpy change for the conversion is:
View answer and explanation
Correct option: B
5954Jmol−15954\mathrm{Jmo}{\mathrm{l}^{ - 1}}
Option B (5954Jmol−15954\mathrm{Jmo}{\mathrm{l}^{ - 1}}) 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 CS2(l)+3O2(g)→CO2(g)+2SO2(g);ΔH=−265 kcal.\mathrm{CS}_2({l})+3 \mathrm{O}_2(\mathrm{g}) \rightarrow \mathrm{CO}_2(\mathrm{g})+2 \mathrm{SO}_2(\mathrm{g}) ; \Delta H= -265 \text{ kcal}.

The enthalpies of formation of CO2\mathrm{CO}_2 and SO2\mathrm{SO}_2 are both negative and are in the ratio 4:3.4: 3. The enthalpy of formation of CS2\mathrm{CS}_2 is +26 kcal mol−1.+26 \mathrm{~kcal} \mathrm{~mol}^{-1}. Calculate the enthalpy of formation of SO2.\mathrm{SO}_2.
View answer and explanation
Correct option: D
−71.7 kcal mol−1-71.7 \mathrm{~kcal} \mathrm{~mol}^{-1}
Option D (−71.7 kcal mol−1-71.7 \mathrm{~kcal} \mathrm{~mol}^{-1}) 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 I2O5(s){I}_2 {O}_5(\mathrm{s}) from the following data.

(i) I2O5(s)+H2O(l)→2HIO3(aq);ΔH=+4.0 kJ{I}_2 {O}_5(\mathrm{s})+{H}_2{O}({l}) \rightarrow 2 {HIO}_3\text{(aq)}; \Delta H=+4.0 \mathrm{~kJ}

(ii) KI(aq)+3HClO(aq)→HIO3(aq)+2HCl(aq)+KCl(aq);ΔH=−322.0 kJ{KI} \text{(aq)} +3 {HClO}\text{(aq)} \rightarrow {HIO}_3 \text{(aq)} +2 {HCl}\text{(aq)}+{KCl}(\mathrm{aq}); \Delta H=-322.0 \mathrm{~kJ}

(iii) NaOH(aq)+HClO(aq)→NaOCl(aq)+H2O(l);ΔH=−44.0 kJ{NaOH}(\mathrm{aq})+{HClO}(\mathrm{aq}) \rightarrow {NaOCl}(\mathrm{aq})+{H}_2 {O}({l}); \Delta H=-44.0 \mathrm{~kJ}

(iv) NaOH(aq)+HCl(aq)→NaCl(aq)+H2O(l);ΔH=−57.0 kJ{NaOH}(\mathrm{aq})+{HCl}(\mathrm{aq}) \rightarrow {NaCl}(\mathrm{aq})+{H}_2 {O}({l}); \Delta H=-57.0 \mathrm{~kJ}

(v) 2NaOH(aq)+Cl2(g)→NaOCl(aq)+NaCl(aq)+H2O(l);ΔH=−100.0 kJ2 {NaOH}(\mathrm{aq})+{Cl}_2(\mathrm{g}) \rightarrow{NaOCl}(\mathrm{aq})+ {NaCl}(\mathrm{aq})+{H}_2 {O}({l}); \Delta H=-100.0 \mathrm{~kJ}

(vi) 2KI(aq)+Cl2(g)→2KCl(aq)+I2(s);ΔH=−224.0 kJ2 {KI}(\mathrm{aq})+{Cl}_2(\mathrm{g}) \rightarrow 2 {KCl}(\mathrm{aq})+{I}_2(\mathrm{s}); \Delta H=-224.0 \mathrm{~kJ}

(vii) H2(g)+1/2 O2(g)→H2O(l);ΔH=−285.0 kJ{H}_2(\mathrm{g})+1 / 2 \, {O}_2(\mathrm{g}) \rightarrow {H}_2 {O}({l}); \Delta H=-285.0 \mathrm{~kJ}

(viii) 1/2 H2(g)+1/2 Cl2(g)→HCl(g);ΔH=−92.0 kJ1 / 2 \,{H}_2(\mathrm{g})+1 / 2 \, {Cl}_2(\mathrm{g}) \rightarrow {HCl}(\mathrm{g}); \Delta H= -92.0 \mathrm{~kJ}

(ix) HCl(g)+aq→HCl(aq);ΔH=−75.0 kJ{HCl}(\mathrm{g})+\mathrm{aq} \rightarrow {HCl}(\mathrm{aq}); \Delta H=-75.0 \mathrm{~kJ}
View answer and explanation
Correct option: A
−169.0 kJ-169.0 \mathrm{~kJ}
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 500 ml500 \mathrm{~ml} of 2 M−KOH2 \mathrm{~M}-{KOH} is added to 500 ml500 \mathrm{~ml} of 2 M−HCl2 \mathrm{~M}-{HCl} and the mixture is well shaken. The rise in temperature T1T_1 is noted. The experiment is again performed using 250 ml250 \mathrm{~ml} of KOH{KOH} solution and 500 ml500 \mathrm{~ml} of HCl{HCl} solution and rise in temperature T2T_2 is again noted. Which of the following is correct?
View answer and explanation
Correct option: D
T1T_1 is 1.5 times as larger as T2T_2
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, 2658 kJ2658 \mathrm{~kJ} of heat is released. The thermochemical reaction for above change is
View answer and explanation
Correct option: C
C4H10(g)+132O2(g)→4CO2(g)+5H2O(l);ΔCH=−2658.0 kJ mol−1\mathrm{C}_4 \mathrm{H_{10}(g})+\frac{13}{2} \mathrm{O_2(g}) \rightarrow 4 \mathrm{CO_2(g})+ 5 \mathrm{H}_2 \mathrm{O}(l) ; \Delta_C H =-2658.0 \mathrm{~kJ} \mathrm{~mol}^{-1}
The correct answer is C (C4H10(g)+132O2(g)→4CO2(g)+5H2O(l);ΔCH=−2658.0 kJ mol−1\mathrm{C}_4 \mathrm{H_{10}(g})+\frac{13}{2} \mathrm{O_2(g}) \rightarrow 4 \mathrm{CO_2(g})+ 5 \mathrm{H}_2 \mathrm{O}(l) ; \Delta_C H =-2658.0 \mathrm{~kJ} \mathrm{~mol}^{-1}) 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 ΔH∘ & ΔS∘\Delta H^{\circ} \,\&\, \Delta S^{\circ} for a process/reaction are 77.2 kJ & 48 J/k77.2 \mathrm{~kJ} \,\&\, 48 \mathrm{~J} / \mathrm{k} respectively. Then find value of log⁡1k\log \frac{1}{k}. Given: Temp is 300 K300 \mathrm{~K}
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 (1 bar,100 ml1 \mathrm{~bar}, 100 \mathrm{~ml}) is taken in an adiabatic container and the pressure increases steeply to 100 bar.100 \mathrm{~bar}. Then at a constant pressure of 100 bar,100 \mathrm{~bar}, volume decrease by 1 ml1 \mathrm{~ml}. Find ΔH\Delta \mathrm{H}.
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 C≡C,C−H,H−H\mathrm{C} \equiv \mathrm{C}, \mathrm{C}-\mathrm{H}, \mathrm{H}-\mathrm{H} and C=C\mathrm{C}=\mathrm{C} are 198,98,103,145 kcal198,98,103,145 \mathrm{~kcal} respectively. The enthalpy change of the reaction CH≡CH+H2→CH2=CH2\mathrm{CH} \equiv \mathrm{CH}+\mathrm{H}_2 \rightarrow \mathrm{CH}_2=\mathrm{CH}_2 is
View answer and explanation
Correct option: D
−40 kcal-40 \mathrm{~kcal}
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 W=−P(ΔV)\mathrm{W}=-\mathrm{P}(\Delta \mathrm{V}) 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 W=−PΔVW = -P\Delta V, and since the initial and final states are the same, ΔV\Delta V 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
S+32O2→SO3+2x  kcal.....(i)    SO2+12O2→SO3+y  kcal.....(ii)S + \frac{3}{2}{O_2} \to S{O_3} + 2x\,\,kcal.....\left( i \right)\,\,\,\,S{O_2} + \frac{1}{2}{O_2} \to S{O_3} + y\,\,kcal.....\left( {ii} \right)
Find out the Enthalpy of formation of SO2S{O_2}:
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, Cp(JK−1 mol−1) = 23 + 0.01 T{C_p}(J{K^{ - 1}}\,mo{l^{ - 1}})\, = \,23\, + \,0.01\,T. If the temperature (T)(T) of 3 moles of silver is raised from 300 K to 1000 K at 1 atm, pressure, the value of ΔH\Delta H 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.
16 Hard
16 of 92
Application +4 | -1
The dissolution of CaCl2⋅6H2O{CaCl}_2 \cdot 6 {H}_2 {O} in a large volume of water is endothermic to the extent of 3.5 kcal/mol.3.5 \mathrm{~kcal/mol}. For the reaction, CaCl2(s)+6H2O(l)→CaCl2⋅6H2O(s);ΔH{CaCl}_2(\mathrm{s})+6 {H}_2 {O}({l}) \rightarrow{CaCl}_2 \cdot 6 {H}_2 {O}(\mathrm{s}) ; \Delta H is −23.2 kcal.-23.2 \mathrm{~kcal}. The heat of solution of anhydrous CaCl2{CaCl}_2 in large quantity of water will be
View answer and explanation
Correct option: B
−19.7 kcal mol−1-19.7 \mathrm{~kcal} \mathrm{~mol}^{-1}
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
56 g56 \mathrm{~g} of iron reacts with HCl\mathrm{HCl} in a closed vessel of fixed volume. Again, same amount of Fe\mathrm{Fe} is made to react in an open beaker at 27∘C27^{\circ} \mathrm{C}. The work done (in cal) in both the cases will be respectively
View answer and explanation
Correct option: D
0,−6000,-600
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 P\mathrm{P}, compressed adiabatically to half of its volume, what is the final pressure?
View answer and explanation
Correct option: A
(2)1.4P(2)^{1.4} \mathrm{P}
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,

CaO(s)+SO3(g)⟶CaSO4(s);ΔG∘=−345.0 kJ\mathrm{CaO}(s)+\mathrm{SO}_3(g) \longrightarrow \mathrm{CaSO}_4(s) ; \Delta G^{\circ}=-345.0 \mathrm{~kJ}

ΔG\Delta G for the reaction at 298 K298 \mathrm{~K} when the pressure of SO3\mathrm{SO}_3 is 0.5 atm0.5 \mathrm{~atm} is
View answer and explanation
Correct option: D
−343.3 kJ-343.3 \mathrm{~kJ}
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 (γ=43)\left(\gamma=\frac{4}{3}\right) is 2.5 cal/K−mol2.5 \mathrm{~cal} / \mathrm{K}-\mathrm{mol} at 25∘C25^{\circ} \mathrm{C} and 1 bar.1 \mathrm{~bar}. The standard molar entropy of the gas at 323∘C323^{\circ} \mathrm{C} and 1 bar is (ln⁡2=0.7)(\ln 2=0.7)
View answer and explanation
Correct option: D
8.1 cal/K−mol8.1 \mathrm{~cal} / \mathrm{K}-\mathrm{mol}
Option D (8.1 cal/K−mol8.1 \mathrm{~cal} / \mathrm{K}-\mathrm{mol}) 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,

Li+(g)+Cl−(g)⟶LiCl(s)\mathrm{Li}^{+}(\mathrm{g})+\mathrm{Cl}^{-}(\mathrm{g}) \longrightarrow \mathrm{LiCl}(\mathrm{s})

From the following data:

ΔsH∘(Li)=160.67 kJ mol−1;12ΔaH∘(Cl2)=122.17 kJ mol−1\Delta_{\mathrm{s}} \mathrm{H}^{\circ}(\mathrm{Li})=160.67 \mathrm{~kJ} \mathrm{~mol}^{-1} ; \quad \frac{1}{2} \Delta_{\mathrm{a}} \mathrm{H}^{\circ}\left(\mathrm{Cl}_2\right)=122.17 \mathrm{~kJ} \mathrm{~mol}^{-1}

ΔiH∘(Li)=520.07 kJ mol−1\Delta_{\mathrm{i}} \mathrm{H}^{\circ}(\mathrm{Li})=520.07 \mathrm{~kJ} \mathrm{~mol}^{-1} ; \quad ΔegH∘(Cl)=−365.26 kJ mol−1\Delta_{\mathrm{eg}} \mathrm{H}^{\circ}(\mathrm{Cl})=-365.26 \mathrm{~kJ} \mathrm{~mol}^{-1}

 and ΔfH∘(LiCl)=−401.66 kJ mol−1\text { and } \Delta_{\mathrm{f}} \mathrm{H}^{\circ}(\mathrm{LiCl})=-401.66 \mathrm{~kJ} \mathrm{~mol}^{-1}
View answer and explanation
Correct option: A
−839.31 kJ mol−1-839.31 \mathrm{~kJ~mol}^{-1}
Option A (−839.31 kJ mol−1-839.31 \mathrm{~kJ~mol}^{-1}) 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 25∘C.25^{\circ} \mathrm{C}.

(a) CH3−CH3→CH3−CH2+H;ΔH1=+420 kJ mol−1(b) CH3−CH2→CH2=CH2+H;ΔH2=+168 kJ mol−1\begin{aligned} & \text{(a) } \mathrm{CH}_3-\mathrm{CH}_3 \rightarrow \mathrm{CH}_3-\mathrm{CH}_2+\mathrm{H}; \Delta H_1=+420 \mathrm{~kJ} \mathrm{~mol}^{-1} \\ & \text{(b) } \mathrm{CH}_3-\mathrm{CH}_2 \rightarrow \mathrm{CH}_2=\mathrm{CH}_2+\mathrm{H}; \Delta H_2=+168 \mathrm{~kJ} \mathrm{~mol}^{-1} \end{aligned}

From these data, the enthalpy change ΔH\Delta H for the reaction 2CH3−CH2→CH3−CH3+CH2=CH22 \mathrm{CH}_3-\mathrm{CH}_2 \rightarrow \mathrm{CH}_3-\mathrm{CH}_3+\mathrm{CH}_2=\mathrm{CH}_2 is
View answer and explanation
Correct option: C
−252 kJ-252 \mathrm{~kJ}
Option C (−252 kJ-252 \mathrm{~kJ}) 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 V1V_1 to a final volume 10V110 V_1 and does 10 kJ10 {~kJ} of work. The initial pressure was 1×107 Pa1 \times 10^7 {~Pa}. Calculate V1V_1.
View answer and explanation
Correct option: A
4.34×10−4 m34.34\times10^{-4}\,m^{3}
Option A (4.34×10−4 m34.34\times10^{-4}\,m^{3}) 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 698.6 kJ/mol698.6 \, \mathrm{kJ} / \mathrm{mol} and the mean bond enthalpy of C−C\mathrm{C}-\mathrm{C} bond in diamond is 348.4 kJ/mol.348.4 \mathrm{~kJ} / \mathrm{mol}. The enthalpy of conversion of graphite into diamond is
View answer and explanation
Correct option: B
+1.8 kJ/mol+1.8 \mathrm{~kJ} / \mathrm{mol}
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
1.215×103J1.215 \times {10^3}\mathrm{J}
Option A (1.215×103J1.215 \times {10^3}\mathrm{J}) is correct because the work done is calculated using the formula W=−PextΔVW = -P_{ext} \Delta V and converting litre atm to Joules.
26 Hard
26 of 92
Application +4 | -1
ΔrH∘\Delta_r H^{\circ} of CS2\mathrm{CS}_2 is 117.36 kJ mol−1117.36 \mathrm{~kJ} \mathrm{~mol}^{-1}

ΔfH∘\Delta_{\mathrm{f}} \mathrm{H}^{\circ} of C(g)\mathrm{C}(\mathrm{g}) is 716.682 kJ mol−1716.682 \mathrm{~kJ} \mathrm{~mol}^{-1}

ΔfH∘\Delta_f H^{\circ} of S(g)\mathrm{S}(g) is 278.805 kJ mol−1278.805 \mathrm{~kJ} \mathrm{~mol}^{-1}

Thus, (C=S)(\mathrm{C}=\mathrm{S}) bond enthalpy in CS2\mathrm{CS}_2 is
View answer and explanation
Correct option: B
578.47 kJ mol−1578.47 \mathrm{~kJ} \mathrm{~mol}^{-1}
Option B (578.47 kJ mol−1578.47 \mathrm{~kJ} \mathrm{~mol}^{-1}) 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 0.153×105Nm−20.153 \times 10^5 \mathrm{Nm}^{-2} at 303 K303 \mathrm{~K} and 0.520×105Nm−20.520 \times 10^5 \mathrm{Nm}^{-2} at 333 K333 \mathrm{~K}. The mean latent heat of evaporation of benzene over this temperature range is
View answer and explanation
Correct option: D
34.2 kJ mol−134.2 \mathrm{~kJ} \mathrm{~mol}^{-1}
Option D (34.2 kJ mol−134.2 \mathrm{~kJ} \mathrm{~mol}^{-1}) 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
H2(g)+12O2(g)→H2O(l)\mathrm{H}_2(\mathrm{g})+\frac{1}{2} \mathrm{O}_2(\mathrm{g}) \rightarrow \mathrm{H}_2 \mathrm{O}({l})

B.E. (H−H)=x1;(\mathrm{H}-\mathrm{H})=x_1; B.E. (O=O)=x2;(\mathrm{O}=\mathrm{O})=x_2; B.E. (O−H)=x3(\mathrm{O}-\mathrm{H})=x_3

Latent heat of vaporization of water liquid into water vapor =x4,=x_4, then ΔHf\Delta H_{\mathrm{f}} (heat of formation of liquid water) is
View answer and explanation
Correct option: C
x1+x22−2x3−x4x_1+\frac{x_2}{2}-2 x_3-x_4
Option C (x1+x22−2x3−x4x_1+\frac{x_2}{2}-2 x_3-x_4) 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 PV5/2=P V^{5 / 2}= constant. By what amount heat is absorbed in the process in 26∘C26^{\circ} \mathrm{C} rise in temperature?
View answer and explanation
Correct option: B
180 J180 \mathrm{~J}
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 kPa\mathrm{kPa} ), a given volume of an ideal gas (Cp,m=7/2R)\left(C_{p, m}=7 / 2 R\right), originally at 400 K400 \mathrm{~K} and 100kPa100 \mathrm{kPa} pressure can be compressed irreversibly adiabatically in order to raise its temperature to 600 K600 \mathrm{~K} :
View answer and explanation
Correct option: B
275 kPa275 \mathrm{~kPa}
Option B (275 kPa275 \mathrm{~kPa}) is correct because it's derived from the adiabatic irreversible compression formula considering the given conditions and Cp,mC_{p,m} value.
Revision notes and key takeaways

Review THERMODYNAMICS in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

  • ✓ This set contains 92 single-correct-answer MCQs on THERMODYNAMICS.
  • ✓ Try each question before opening its answer. Read the explanation where one is available.
  • ✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.
Showing 1-30 of 92 questions
0 /92
0✓ 0✗
0% Accuracy
Type at least 2 characters or jump directly:
🔓

Save your learning progress

Sign in with a free account to save your practice answers and quiz results, then return to them when you revise.