Thermodynamics PYQs - Last 5 Years

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All Thermodynamics PYQs Last 10 Years Create chapter test

Practice 180 MHT CET 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 5 Years Thermodynamics Questions

Showing 50 of 180 filtered questions.

1Thermodynamics

Which of the following symbols represent heat of reaction at constant volume?

2Thermodynamics

Calculate heat required to convert 9 g of liquid water to water vapours from following equations.
$$\begin{aligned}
& \mathrm{H}_{2(\mathrm{~g})}+\frac{1}{2} \mathrm{O}_{2(\mathrm{~g})} \longrightarrow \mathrm{H}_2 \mathrm{O}_{(\mathrm{g})}...

3Thermodynamics

One mole of a gas occupying 3 L volume is expanded against a constant external pressure of 1 bar to a volume of 15 L . Calculate work done by the system

4Thermodynamics

Which from the following defines enthalpy of a system?

5Thermodynamics

Calculate Gibbs energy change for a reaction having $\Delta \mathrm{H}=31400 \mathrm{~J}, \Delta \mathrm{~S}=32 \mathrm{~J} \mathrm{~K}^{-1}$ at $1000^{\circ} \mathrm{C}$ ?

6Thermodynamics

What is the value of standard enthalpy of formation of dihydrogen?

7Thermodynamics

If bond formation energy of $\mathrm{H}-\mathrm{H}$ bond is $-433 \mathrm{~kJ} \mathrm{~mol}^{-1}$ find the bond dissociation energy for 0.5 mole $H_{2(g)}$.

8Thermodynamics

Given that \(\mathrm{C}_{(\mathrm{g})}+4 \mathrm{H}_{(\mathrm{g})} \longrightarrow \mathrm{CH}_{4(\mathrm{g})} \Delta \mathrm{H}^{\circ}=-1665 \mathrm{~kJ}\)
What is bond energy per mole of $\mathrm{C}-\mathrm{H}$ bond?

9Thermodynamics

Which of the following statements is appropriate as per first law of thermodynamics?

10Thermodynamics

Find value of Q from following equations.
(i) $\mathrm{C}_{(\mathrm{s})}+\mathrm{O}_{2(\mathrm{~g})} \longrightarrow \mathrm{CO}_{2(\mathrm{~g})} \Delta \mathrm{H}=\mathrm{QkJ}$
(ii) $\mathrm{C}_{(\mathrm{s})}+\frac{1}{2} \mathrm{O}_{2(8)} ...

11Thermodynamics

A gas absorbs certain amount of heat and expands by $200 \mathrm{~cm}^3$ against a constant external pressure of $2 \times 10^5 \mathrm{Nm}^{-2}$. What is work done by system?

12Thermodynamics

Which among the following is NOT an intensive property?

13Thermodynamics

In a process 605 J heat is absorbed by the system and 380 J work is done by the system on surrounding. What is the value of $\Delta$U?

14Thermodynamics

Calculate enthalpy change for following reaction.
\(\mathrm{H}_2 \mathrm{C}=\mathrm{CH}_{2(\mathrm{~g})}+\mathrm{H}_{2(\mathrm{~g})} \longrightarrow \mathrm{H}_3 \mathrm{C}-\mathrm{CH}_{3(\mathrm{~g})}\)
[The bond energy of $\mathrm{C}-\mat...

15Thermodynamics

Which of the following is true for the value of $\Delta \mathrm{H}-\Delta \mathrm{U}$ at constant volume?

16Thermodynamics

If 100 L gas is enclosed in a cylinder, absorbs 302.6 J of heat and expands to 200 L against constant external pressure of 2 atm . Calculate internal energy change of the gas.

17Thermodynamics

Find work done on 2 mole of an ideal gas at $27^{\circ} \mathrm{C}$ if it is compressed reversibly and isothermally from $5.05 \times 10^6 \mathrm{Nm}^{-2}$ to $1.01 \times 10^5 \mathrm{Nm}^{-2}$ pressure.

18Thermodynamics

The enthalpy of vaporisation of a liquid is $30 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and entropy of vaporisation is $75 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$. Calculate boiling point of liquid at 1 atm .

19Thermodynamics

Which of the following equation relates temperature of a reaction with $\Delta \mathrm{H}^{\circ}$ and $\Delta \mathrm{S}^{\circ}$ at equilibrium?

20Thermodynamics

Calculate internal energy change of a system if work done by the system is 8 J and heat supplied to it is 40 J .

21Thermodynamics

Calculate standard internal energy change for $\mathrm{OF}_{2(\mathrm{~g})}+\mathrm{H}_2 \mathrm{O}_{(\mathrm{g})} \longrightarrow 2 \mathrm{HF}_{(\mathrm{g})}+\mathrm{O}_{2(\mathrm{~g})}$ at 300 K , if $\Delta_{\mathrm{f}} \mathrm{H}^{\cir...

22Thermodynamics

100 ml of $\mathrm{H}_{2(\mathrm{~g})}$ and 100 ml of $\mathrm{Cl}_{2(\mathrm{~g})}$ were allowed to react at 1 bar pressure as
\(\mathrm{H}_{2(\mathrm{~g})}+\mathrm{Cl}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{HCl}_{(\mathrm{g})}\)
What ...

23Thermodynamics

Under similar conditions enthalpy of freezing is exactly opposite to

24Thermodynamics

Calculate the value of $\Delta G$ for the following reaction. $\mathrm{N}_2 \mathrm{O}_{4(\mathrm{~g})} \longrightarrow 2 \mathrm{NO}_{2(\mathrm{~g})}$
if $\Delta \mathrm{H}=57.44 \mathrm{~kJ}$ and $\Delta \mathrm{S}=176 \mathrm{~J} \mathrm...

25Thermodynamics

In a particular reaction ' x ' kJ of heat is released by the system and ' y ' kJ of work done is done on the system. What is internal energy change?

26Thermodynamics

A system performs mechanical work equal to 15 kJ and looses 2 kJ of heat to surrounding. What is the change in internal energy of a system?

27Thermodynamics

Find the constant external pressure required to expand a gas from 2.5 L to 4.5 L if amount of work done is 500 J at 298 K ?

28Thermodynamics

2 moles of an ideal gas expands isothermally from $5 \mathrm{dm}^3$ to $10 \mathrm{dm}^3$ at a constant external pressure of 1.5 bar. Calculate work done.

29Thermodynamics

Which among the following pair of properties are intensive?

30Thermodynamics

An ideal gas expands against constant external pressure of 2 bar from 5 lit to 8 lit and absorbs 10 kJ of heat. What is $\Delta \mathrm{U}$ of the system?

31Thermodynamics

Calculate the enthalpy change when 12 g carbon react with sufficient hydrogen to form methane. If enthalpy of formation of methane is $-75 \mathrm{~kJ} \mathrm{~mol}^{-1}$.

32Thermodynamics

Two moles of an ideal gas are compressed isothermally and reversibly from 40 L to 20 L at 300 K . What is the work done? $\left(\mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\right)$

33Thermodynamics

Identify the process from following such that volume of system remains constant.

34Thermodynamics

Which from following statements is true about internal energy?

35Thermodynamics

Which of the following equations indicates increase in entropy?

36Thermodynamics

2 moles of an ideal gas are expanded isothermally and reversibly from 20 L to 40 L at 300 K . Calculate work done. ( $\mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$).

37Thermodynamics

A gas expands isothermally against a constant external pressure of 1 bar from 10 dm$^3$ to 20 dm$^3$ by absorbing 800 J of heat from surrounding. Calculate value of $\Delta$U.

38Thermodynamics

For the reaction $\mathrm{CH}_{4(\mathrm{~g})}+\mathrm{H}_{2(\mathrm{~g})} \longrightarrow \mathrm{C}_2 \mathrm{H}_{6(\mathrm{~g})}$ $\mathrm{K}_{\mathrm{p}}=3.356 \times 10^{17}$, calculate $\Delta \mathrm{G}^{\circ}$ for the reaction at 2...

39Thermodynamics

For an ideal gas, the heat of reaction at constant pressure and heat of reaction at constant volume are related by equation _________

40Thermodynamics

Calculate the value of \(\Delta G\) for following reaction at \(300 \mathrm{~K}\).
$$\begin{aligned}
& \mathrm{H}_2 \mathrm{O}_{(\mathrm{s})} \longrightarrow \mathrm{H}_2 \mathrm{O}_{(l)} \\
& \left(\Delta \mathrm{H}=7 \mathrm{~kJ}, \Delta ...

41Thermodynamics

An ideal gas expands by performing \(200 \mathrm{~J}\) of work, during this internal energy increases by \(432 \mathrm{~J}\). What is enthalpy change?

42Thermodynamics

Which among the following reactions exhibits \(\Delta \mathrm{H}=\Delta \mathrm{U}\) ?

43Thermodynamics

An ideal gas expands by \(1.5 \mathrm{~L}\) against a constant external pressure of \(2 \mathrm{~atm}\) at \(298 \mathrm{~K}\). Calculate the work done?

44Thermodynamics

What is the value of \(\Delta H-\Delta U\) for the following reaction?
\(2 \mathrm{C}_{(\mathrm{s})}+3 \mathrm{H}_{2(\mathrm{~g})} \rightarrow \mathrm{C}_2 \mathrm{H}_{6(\mathrm{~g})}\)

45Thermodynamics

For \(\mathrm{NaCl}_{(\mathrm{s})}\) enthalpy of solution is \(4 \mathrm{~kJ} \mathrm{~mol}^{-1}\) and lattice enthalpy is \(790 \mathrm{~kJ} \mathrm{~mol}^{-1}\). What is hydration enthalpy of \(\mathrm{NaCl}\) ?

46Thermodynamics

Identify false statement regarding isothermal process from following.

47Thermodynamics

Calculate \(\Delta \mathrm{H}\) for following reaction, at \(25{ }^{\circ} \mathrm{C}\).
$$\mathrm{NH}_2 \mathrm{CN}_{(\mathrm{g})}+\frac{3}{2} \mathrm{O}_{2(\mathrm{~g})} \longrightarrow \mathrm{N}_{2(\mathrm{~g})}+\mathrm{CO}_{2(\mathrm{~...

48Thermodynamics

If enthalpy change for following reaction at \(300 \mathrm{~K}\) is \(+7 \mathrm{~kJ} \mathrm{~mol}^{-1}\) find the entropy change of surrounding?
\(\mathrm{H}_2 \mathrm{O}_{(\mathrm{s})} \longrightarrow \mathrm{H}_2 \mathrm{O}_{(\ell)}\)

49Thermodynamics

Calculate the PV type of work for the following reaction at 1 bar pressure.
$$\mathrm{\mathop {{C_3}{H_{6(g)}}}\limits_{(150\,mL)} + \mathop {HC{l_{(g)}}}\limits_{(150\,mL)} \buildrel {} \over
\longrightarrow \mathop {{C_3}{H_7}C{l_{(g)}}...

50Thermodynamics

Which from following thermodynamic properties is a path function?