Thermodynamics PYQs - Last 10 Years

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Practice 42 COMEDK 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 42 of 42 filtered questions.

1Thermodynamics

$\Delta \mathrm{H}$ and $\Delta \mathrm{S}$ for a reaction are $35.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $83.6 \mathrm{~J} \mathrm{~K}^{-1}$ respectively. Assuming that $\Delta \mathrm{H}$ and $\Delta \mathrm{S}$ do not vary with temperatu...

2Thermodynamics

Ozone is formed by the reaction
\(\mathrm{O}_{2(g)}+\mathrm{O}_{(g)} \rightarrow \mathrm{O}_{3(g)}, \Delta \mathrm{H}=-107.2 \mathrm{~kJ} .\)
Given $\mathrm{O}=0$ bond energy is $498.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$, the average bond en...

3Thermodynamics

The heat of combustion of carbon to $\mathrm{CO}_2$ is $-393.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$.
The heat released on the formation of 35.2 g of $\mathrm{CO}_2$ by combustion of C is:

4Thermodynamics

The standard enthalpies of formation of $\mathrm{CH}_4(\mathrm{~g}), \mathrm{CO}_2(\mathrm{~g})$ and $\mathrm{H}_2 \mathrm{O}(\mathrm{l})$ are $-74.8 \mathrm{~kJ} \mathrm{~mol}^{-1},-393.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $-285.8 \mathr...

5Thermodynamics

For an ideal gas undergoing an isothermal change, there is $\_\_\_\_$

6Thermodynamics

Identify the INCORRECT statement

7Thermodynamics

Given that the standard enthalpy of combustion of $\mathrm{C}_{(\mathrm{S})}$ and $\mathrm{CS}_2(\mathrm{l})$ are -393.3 and $-1108.76 \mathrm{~kJ} / \mathrm{mol}$ respectively and the standard enthalpy of formation of $\mathrm{CS}_2$ is $1...

8Thermodynamics

0.4 g of Propane burns completely at 300 K in a bomb calorimeter. The temperature of the calorimeter and surrounding water rises by $0.4^0 \mathrm{C}$. If the heat capacity of the calorimeter and contents is $24 \mathrm{~kJ} \mathrm{~K}^{-1...

9Thermodynamics

For a reaction $\mathrm{X}_2(\mathrm{l})+\mathrm{Y}_2(\mathrm{~g}) \leftrightharpoons 2 \mathrm{XY}(\mathrm{g})$, the $\Delta \mathrm{H}^0$ and $\Delta \mathrm{S}^0$ are $+29.3 \mathrm{~kJ} / \mathrm{mol}$ and $104.1 \mathrm{~J} \mathrm{~K}...

10Thermodynamics

Two moles of an ideal gas at 1 bar pressure and 298 K is expanded into vacuum to double the volume. The work done is :

11Thermodynamics

In the decomposition of limestone to lime, the values of $\Delta H^o$ and $\Delta S^o$ are $+179.1 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $160.2 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$. Calculate the temperature above which conversio...

12Thermodynamics

The enthalpies of combustion of $\mathrm{H}_2, \mathrm{C}$ (graphite) and $\mathrm{C}_2 \mathrm{H}_6(\mathrm{~g})$ are $-286.0,-394.0$ and $-1560.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$ at $25^{\circ} \mathrm{C}$ and 1 atm pressure. The enthalpy...

13Thermodynamics

For a hypothetical chemical reaction $\mathrm{A}_2+3 \mathrm{~B}_2+$ Heat $\cdots\rightarrow 2 \mathrm{AB}_3$, which one of the following combinations of state variables would support the spontaneity of the reaction at a particular temperat...

14Thermodynamics

The Enthalpy of combustion of 1.0 mole of a reactive metal X at $27^{\circ} \mathrm{C}$ and 1.0 bar pressure to form a solid oxide ( XO ) is $-601.83 \mathrm{~kJ} / \mathrm{mol}$. The Internal energy change for this reaction is ___________ ...

15Thermodynamics

For the reaction $\mathrm{A}_2+\mathrm{B}_2 \cdots \cdots>2 \mathrm{AB}, \Delta \mathrm{H}_{\mathrm{f}}=-400 \mathrm{~kJ} / \mathrm{mol}$. The bond dissociation enthalpies of $\mathrm{A}_2$, $\mathrm{B}_2$ and AB are in the ratio $1: 0.75: ...

16Thermodynamics

Given: \(\Delta \mathrm{G}^0{ }_{\mathrm{f}}\) of \(\mathrm{C}_2 \mathrm{H}_2\) is \(2.09 \times 10^5 \mathrm{~J} / \mathrm{mol}\) and \(\Delta \mathrm{G}_{\mathrm{f}}^0\) of \(\mathrm{C}_6 \mathrm{H}_6\) is $$1.24 \times 10^5 \mathrm{~J} /...

17Thermodynamics

If the enthalpy of formation of a diatomic molecule \(\mathrm{AB}\) is \(-400 \mathrm{~kJ} / \mathrm{mol}\) and the bond dissociation energies of \(\mathrm{A}_2\) and \(\mathrm{B}_2\) and \(\mathrm{AB}\) are in the ratio \(2: 1: 2\), what i...

18Thermodynamics

The standard enthalpy of formation of \(\mathrm{CH}_4\), the standard enthalpy of sublimation of Carbon and the bond dissociation enthalpy of Hydrogen gas are \(-74.8,+719.6\) and \(436 \mathrm{~kJ} / \mathrm{mol}\) respectively. What is th...

19Thermodynamics

5.0 moles of an Ideal gas at 3.0 atm pressure and \(27^{\circ} \mathrm{C}\) is compressed isothermally to half its volume by application of an external pressure of \(3.5 \mathrm{~atm}\). What is the amount of work done (in joules) on the ga...

20Thermodynamics

The Enthalpy of combustion of \(\mathrm{C}_6 \mathrm{H}_5 \mathrm{COOH}(\mathrm{s})\) at \(25^{\circ} \mathrm{c}\) and 1.0 atm pressure is \(-2546 \mathrm{~kJ} / \mathrm{mol}\). What is the Internal energy change for this reaction?

21Thermodynamics

Given :
$$
\begin{gathered}
\Delta \mathrm{H}^0 \mathrm{f}_{\text {of }} \mathrm{CO}_2(\mathrm{~g})=-393.5 \mathrm{~kJ} / \mathrm{mol} \\
\Delta \mathrm{H}^0{ }_{\mathrm{f}} \text { of } \mathrm{H}_2 \mathrm{O}(\mathrm{l})=-286 \mathrm{~kJ}...

22Thermodynamics

The \(\Delta \mathrm{H}_{(\mathrm{f})}^{\mathrm{o}}\) of \(\mathrm{NO}_2(\mathrm{~g})\) and \(\mathrm{N}_2 \mathrm{O}_4(\mathrm{~g})\) are 16.0 and \(4.0 \mathrm{k} \mathrm{cal} \mathrm{mol}^{-1}\) respectively. The heat of dimerisation of ...

23Thermodynamics

At Constant volume, the heat required to raise the temperature of \(4.48 \mathrm{~L}\) of an ideal gas at STP by \(15^{\circ} \mathrm{C}\) is 12.0 calories.
The \(\mathrm{C_p}\) of the gas is _____________
$$(\mathrm{R}=2 \mathrm{~Cal} \ma...

24Thermodynamics

The correct option for free expansion of an ideal gas under adiabatic condition is:

25Thermodynamics

A Gas taken in a closed vessel is heated from \(54^{\circ} \mathrm{C}\) to \(1254^{\circ} \mathrm{C}\). The pressure of the gas becomes ___________ times its original pressure \(\mathrm{P_1}\)

26Thermodynamics

Gaseous Nitrous oxide decomposes at \(298 \mathrm{~K}\) to form Nitrogen gas and Oxygen gas. The \(\Delta \mathbf{H}\) for the reaction at \(1.0 \mathrm{~atm}\) pressure and \(298 \mathrm{~K}\) is \(\mathbf{- 1 6 3 . 1 5} \mathbf{~ k J}\). ...

27Thermodynamics

\(5.8 \mathrm{~g}\) of a gas maintained at \(95^{\circ} \mathrm{C}\) occupies the same volume as \(0.368 \mathrm{~g}\) of hydrogen gas maintained at a temperature of \(17^{\circ} \mathrm{C}\) and pressure being the same atmospheric pressure...

28Thermodynamics

For an adiabatic change in a system, the condition which is applicable is

29Thermodynamics

If 2 moles of \(\mathrm{C}_6 \mathrm{H}_6(\mathrm{~g})\) are completely burnt \(4100 \mathrm{~kJ}\) of heat is liberated. If \(\Delta H^{\circ}\) for \(\mathrm{CO}_2(\mathrm{~g})\) and \(\mathrm{H}_2 \mathrm{O}(l)\) are \(-410\) and $$-285 ...

30Thermodynamics

The difference between heat capacity at constant pressure and heat capacity at constant volume is

31Thermodynamics

In which of the following changes, entropy decreases?

32Thermodynamics

The relation between work done in reversible and irreversible process is

33Thermodynamics

Which of the following are not path functions?
I. H \(-\) TS
II. W
III. q
IV. q + W

34Thermodynamics

The value of \(\Delta G^\circ\) for the phosphorylation of glucose in glycolysis is 13.8 kJ/mol. The value of \(K_C\) at 298 K is

35Thermodynamics

Calculate the difference between C\(_p\) and C\(_V\) for 10 moles of an ideal gas

36Thermodynamics

The change in the energy of system if 500 cal of heat energy are added to a system and system does 350 cal of work on the surroundings will be

37Thermodynamics

When the expansion of a gas occurs in vacuum and at constant volume, then

38Thermodynamics

Entropy of the universe is

39Thermodynamics

Consider the reaction,
C(s) + O\(_2\)(g) \(\rightarrow\) CO\(_2\)(g) + 393.5 kJ
The signs of \(\Delta H,\Delta S\) and \(\Delta G\) respectively are

40Thermodynamics

In which of the following process, a maximum
increase in entropy is observed?

41Thermodynamics

Thermodynamic standard conditions of
temperature and pressure are

42Thermodynamics

Which of the following is an intensive property?