NEET PYQ Thermodynamics (C) - Chapter-wise Questions with Solutions

About Thermodynamics (C) PYQs

Thermodynamics (C) has 730 previous year questions in the Quantrex Academy NEET UG Chemistry bank. The 220 questions in this list come from NEET (97), AIIMS (61), MHT CET Medical (33) and 1 other source, spanning 2001 to 2026. Each question opens on its own page with the options, the correct answer and the worked solution where available.

NEET Thermodynamics (C) PYQs with Solutions

About Thermodynamics (C) PYQs

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Thermodynamics (C) questions with solutions

A certain organic solvent has Δ H\_vap = 28.50\ kJ mol^ -1 and Δ S\_vap = 88.2\ J K^ -1 \ mol^ -1 at 1 bar. Calculate its normal boiling point (where Δ G = 0 ).

Which of the following statements regarding spontaneous process is NOT true?

Calculate Δ H for a reaction, 2X_ (g) + Y_ (g) arrow 2Z_ (g) at 298 K if Δ U = -10.5 kJ and R = 8.314\ J K^ -1 \ mol^ -1 .

500\ mL of nitrogen gas and 750\ mL hydrogen gas were allowed to react at 1\ bar pressure according to reaction, N_ 2(g) + 3H_ 2(g) arrow 2NH_ 3(g) What is PV type of work done

The relationship between Δ H and Δ U for the reaction, PCl_3(g) + Cl_2(g) arrow PCl_5(g) is given as

What would be the heat released in kJ when 450\ cm^3 of 0.02\ M\ H_2SO_4 is mixed with 650\ cm^3 of 0.1M\ NaOH ? (Heat of neutralization of H_2SO_4 and NaOH is -114\ kJ/mol of

Identify from following reactions that it takes place with Δ H = Δ U .

Calculate the work done in the following reaction at 300\ K , A(g) + B(g) = 2C(g) [R = 8.314\ JK^ -1 mol^ -1 ]

The bond enthalpies of H-H, Cl-Cl, and H-Cl bonds are 437 kJ/mol, 239 kJ/mol, and 433 kJ/mol respectively. Calculate the enthalpy of formation of HCl.

Which of the following is applicable for isothermal process?

What is the work done in the formation of 1 mole gaseous methane from solid carbon and gaseous hydrogen at 27^ ^ ∘ C ? ( R=8.314\ J k^ -1 mol^ -1 )

Which of the following physical transformations is an exothermic?

1 mole of certain gas expands isothermally and reversibly from 1 dm^3 to 10 dm^3 and performs -4308 J work. Calculate the temperature at which expansion of gas takes place [R =

Which of the following processes is an example of decrease in entropy?

Calculate the enthalpy of formation of HCl if bond enthalpies of H - H , Cl - Cl and H - Cl bonds are 434 kJ mol^ -1 , 242 kJ mol^ -1 and 431 kJ mol^ -1 , respectively.

When is the reaction spontaneous?

Determine the constant external pressure required to compress 2 mole of an ideal gas from volume 10.8\ dm^3 to 5.4\ dm^3 if the work obtained is 2460 J.

For a certain reaction, the enthalpy change and entropy change are +50 kJ and -50 J/K respectively at 27^ ^ ∘ C, What is the Gibbs free energy change of reaction?

What is the enthalpy of formation of HF if bond enthalpies of H-H, F-F and H-F bonds are 434 kJ/mol, 158 kJ/mol and 565 kJ/mol respectively. ?

Which of the following properties of the system is both state function and intensive property as well?

Which of the following is NOT an intensive property?

If, i) C + 2S arrow CS_2 , Δ H = 117\ kJ ii) C + O_2 arrow CO_2 , Δ H = -393\ kJ iii) S + O_2 arrow SO_2 , Δ H = -297\ kJ Find the heat of combustion of CS_2 .

Calculate the amount of work done in the oxidation of 1 mole of HCl(g) at 127^ ^ ∘ C if 4\,HCl(g) + O_2(g) arrow 2Cl_2(g) + 2H_2O(g) ; [ R = 8.314 JK^ -1 mol^ -1 ]

A gas is compressed by an average pressure of 0.50 atmosphere, so as to decrease its volume from 400\ cm^3 to 200\ cm^3 . What will be the work done in this case?

In which of the following changes, entropy of the system decreases?

Enthalpy of combustion of carbon to carbon dioxide is -390\ kJ/mol . What is the amount of heat released when 35\ g of carbon dioxide is formed from the reaction of carbon and

The ' x ' moles gas is allowed to expand isothermally and reversibly from 10\ dm^3 to 20\ dm^3 at 300\ K and -17290\ J work is obtained. Find the value of ' x '. [2.303 × R =

Which of the following processes exhibits that Δ U = Q_v ?

Standard enthalpy of vaporization Δ_ vap H^0 for water at 100^ ^ ∘ C is 40.66 kJ mol^ -1 . What is the internal energy of vaporization of water at 100^ ^ ∘ C (in kJ mol^ -1 )?

Determine the temperature at which 2 moles of oxygen gas expands isothermally and reversibly from 2\ dm^3 to 20\ dm^3 performs -11490\ J of work [2.303 × R = 19.15\ JK^ -1 mol^ -1

Calculate the work done when an ideal gas expands from 1 × 10^ -3 to 1 × 10^ -2 \ m^3 at 300 K against constant pressure of 1 × 10^5\ Nm^ -2 . ?

What is the work done when an ideal gas (0.300 mol) expands in vacuum?

For a reaction, Δ ^ ^ ∘ = -5.7 kJ mol^ -1 at 298 K. Calculate K. ( R = 8.314 J K^ -1 mol^ -1 )

Consider the reversible processes for 1.0 mol of an ideal gas as shown in the figure. Processes 2 and 4 are adiabatic. w_1 , w_2 , w_3 and w_4 represent work done (in calories) in

Consider the following reaction : 2A (g) + B (g) arrow 2D (g) Δ U^ = -10 kJ mol ^ -1 and Δ S^ = -44 J K ^ -1 at 298 K. Identify the correct option with Δ G^ for the reaction and

Two moles of an ideal gas undergo free expansion from 10 L to 100 L at 300 K. The values of Δ S_ system and Δ S_ surroundings are (R is universal gas constant)

At a certain temperature, T (K), during a process, 500 J is absorbed by the system and work of 200 J is done by the system. Then, change in internal energy of the system is :

A protein undergoes reversible thermal denaturation from its initial state N to denatured state D according to NleftharpoonsD . At 60 °C, the concentrations of both N and D are

C(~s)+2 H_2(~g) arrow CH_4(~g) ; Δ H=-74.8 ~kJ ~mol^ -1 Which of the following diagrams gives an accurate representation of the above reaction? [R arrow reactants; P arrow

The standard heat of formation, in kcal / mol^ of Ba^ 2+ is : [Given : standard heat of formation of SO_4^ 2- ion (aq) =-216 kcal / mol , Standard heat of crystallisation of

Choose the correct statement for the work done in the expansion and heat absorbed or released when 5 litres of an ideal gas at 10 atmospheric pressure isothermally expands into

Match List-I with List-II: Choose the correct answer from the options given below:

For an endothermic reaction: (A) qp_ p is negative. (B) Δ_r H is positive. (C) Δ_r H is negative. (D) q_ p is positive. Choose the correct answer from the options given below:

In which of the following processes entropy increases? A. A liquid evaporates to vapour. B. Temperature of a crystalline solid lowered from 130 K to 0 K . C. 2 NaHCO_ 3(~s) arrow

Match List I with List II. Choose the correct answer from the options given below:

The work done during reversible isothermal expansion of one mole of hydrogen gas at 25^ ∘ C from pressure of 20 atmosphere to 10 atmosphere is (Given R=2.0 cal K^ -1 ~mol^ -1 )

For the following reaction at 300 K A_2(~g)+3 ~B_2(~g) arrow 2 AB_3(~g) the enthalpy change is +15 kJ then the internal energy change is:

Consider the following reaction: 2 H_2(~g)+O_2(~g) arrow 2 H_2 O(g) Δ_ r H^ ∘ =-483.64 ~kJ . What is the enthalpy change for decomposition of one mole of water? (Choose the right

Which amongst the following options is the correct relation between change in enthalpy and change in internal energy?

The equilibrium concentrations of the species in the reaction A + B ⇋ C + D are 2, 3, 10and6mol L ^ - 1 respectively at 300K . ∆ G ^ ∘ for the reaction is (R = 2cal / molK)

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: In equation ∆ _ r G = - nFE _ cell value of ∆ _ r G depends on n

One mole of an ideal gas at 300 ~K is expanded isothermally from 1 ~L to 10 ~L volume. Δ U for this process is (Use R=8.314 ~J ~K^ -1 ~mol^ -1 )

Which of the following p - V curve represents maximum work done?

For irreversible expansion of an ideal gas under isothermal condition, the correct option is:

Which one among the following is the correct option for right relationship between C _ p and C _ v for one mole of ideal gas?

If for a certain reaction Δ _ r H is 30 kJmol ^ - 1 at 450K, the value of Δ _ r S (in JK ^ - 1 mol ^ - 1 ) for which the same reaction will be spontaneous at the same temperature

For the reaction, 2Cl(g) → Cl _ 2 (g) , the correct option is

At standard conditions, if the change in the enthalpy for the following reaction is - 109 kJmol ^ - 1 H _ 2 ( g ) + Br _ 2 ( g ) → 2 HBr _ ( g ) Given that bond energy of H _ 2

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

Hydrolysis of sucrose is given by the following reaction. Sucrose + H _ 2 O ⇌ Glucose + Fructose If the equilibrium constant ( K _ C ) is 2 × 10 ^ 13 at 300K , the value of Δ _ r

In isolated system, find the condition for spontaneous reaction.

At 25^ ∘ C , when 1 mole of butane is heated, CO_2 and liquid H_2 O are formed, then the work done is

Reaction, A leftharpoons B+3 C at 25^ ∘ C is in equilibrium. If equilibrium constant and Gibbs' free energy for this reaction are y and x respectively, then the Gibbs' free energy

Assertion : U is a state function. Reason : T is an intensive property.

Assertion : The graph between P v / s 1 / V is a straight line. Reason : At constant temperature, P ∝ 1 / V .

What is the value of γ for mono atomic gas (ideal gas)?

If equilibrium constant is 2.6 × 10^8 at 298 K then find the value of Δ G^ ∘ .

An ideal gas expands isothermally from 10^ -3 ~m^3 to 10^ -2 ~m^3 at 300 ~K against a constant pressure of 10^5 Nm^ -2 . The work done on the gas is

Reversible expansion of an ideal gas under isothermal and adiabatic conditions are as shown in the figure. A B arrow Isothermal expansion A C arrow Adiabatic expansion Which of

Under the isothermal condition, a gas at 300K expands from 0.1L to 0.25L against a constant external pressure of 2 bar. The work done by the gas is (Given that 1L bar = 100J )

In which case change in entropy is negative?

1 mole of an ideal gas expands isothermally reversibly from 2 litre to 4 litre and 3 moles of the same gas expands from 2 litre to x litre and doing same work, what is ' x '?

If one monoatomic gas is expanded adibatically from 2 ~L to 10 ~L at 1 ~atm external pressure then the value of Δ U (in atm L ) is

What is the entropy change in 2 ~mol ~N_2 , when its temperature is taken from 400 ~K to 800 ~K , at constant pressure?

Assertion : Addition of Q and w gives Δ U . Reason : Addition of two path functions cannot give state function.

Which of the following are extensive properties?