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JEE Thermodynamics (C) PYQs with Solutions

50 previous year questions from Thermodynamics (C) (JEE Main & Advanced NSEC) with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

50 questionsNSECAnswers + solutions

About Thermodynamics (C) PYQs

Thermodynamics (C) has 50 previous year questions in the Quantrex Academy JEE Main & Advanced NSEC bank. The 50 questions in this list come from Olympiad workbook (50). Each question opens on its own page with the options, the correct answer and the worked solution where available.

Thermodynamics (C) questions with solutions

1

At constant volume, 6.0 mol of H_2 gas at 0^ ^ ^ ∘ C and 100 kPa was heated to 250 kPa . The molar heat of H_2 at constant pressure (C_ P )=28.9 ~J ~mol^ -1 . ( assume that the

Olympiad workbook Solution View → 2

Hydrazine used in rocket fuels can be obtained by the reaction of ammonia and hydrogen peroxide according to the following equation 2 NH_3(~g)+H_2 O_2(l) arrow N_2 H_4(l)+2 H_2

Olympiad workbook Solution View → 3

The daily energy requirement of a teenager is 7800 kJ . As calculated from the data given in the table below, the amount of glucose he has to consume (g) per day assuming that the

Olympiad workbook Solution View → 4

Three samples of 100 g of water (samples I, II and III), initially kept at 1 atm pressure and 298 K were given the following treatments. Sample I was heated to 320 K and cooled to

Olympiad workbook Solution View → 5

Given Δ_r H^ ^ ^ ∘ =-54.08 ~kJ ~mol^ -1 and Δ_r S^ ^ ^ ∘ =10.0 ~J ~mol^ -1 at 25^ ^ ^ ∘ C , the value of _ 10 K for the reaction A leftharpoons B is

Olympiad workbook Solution View → 6

Standard molar enthalpy of formation of CO_2(~g) is equal to

Olympiad workbook Solution View → 7

For the conversion CCl_4(l) arrow CCl_4(~g) at 1 bar and 350 K , the correct set of thermodynamic parameters is (Boiling point of CCl_4 is 77^ ^ ^ ∘ C )

Olympiad workbook Solution View → 8

The work done (kJ) in the irreversible isothermal compression of 2.0 moles of an ideal gas from 1 bar to 100 bar at 25^ ^ ^ ∘ C at constant external pressure of 500 bar is

Olympiad workbook Solution View → 9

2.0 L of N_2 gas kept at 25^ ^ ^ ∘ C and 5 atm pressure were expanded isothermally against a constant pressure of 1 atm until the pressure of the gas reaches 1 atm . Assuming

Olympiad workbook Solution View → 10

At 298 K , change in internal energy for the complete combustion of fullerene, C_ 60 (~s) , an allotrope of carbon, and the enthalpy of formation of CO_2(~g) are -25970 ~kJ ~mol^

Olympiad workbook Solution View → 11

The lattice enthalpy and enthalpy of solution in water for solid NaCl are 753 kJ mol^ -1 and 5 ~kJ ~mol^ -1 respectively(Fig above). If the solution enthalpies of Na^ + and Cl^

Olympiad workbook Solution View → 12

For the following spontaneous process H_2 O_ (l) arrow H_2 O_ (s) at 268 K , which of the following is true?

Olympiad workbook Solution View → 13

The normal boiling point and Δ H_ vap of a liquid ' X ' are 400 K and 40 ~kJ ~mol^ -1 respectively. Assuming Δ H_ vap to be constant, which of the following is correct? I. Δ S_

Olympiad workbook Solution View → 14

For the reaction 4 NO_2(~g)+O_2(~g) arrow 2 ~N_2 O_5(~g), Δ H_ reaction =-112 ~kJ . If the N_2 O_5 is assumed to be formed in the reaction as a solid, Δ H_ reaction will be (Δ H_

Olympiad workbook Solution View → 15

Following is the P vs V plot of a cyclic process 1 arrow 2,2 arrow 3,3 arrow 4,4 arrow 1 , denoted as I, II, III and IV respectively for a system of one mole of an ideal gas.

Olympiad workbook Solution View → 16

Which reaction is spontaneous at all temperatures at standard pressure and concentration?

Olympiad workbook Solution View → 17

Heat of reaction and heat of formation will be the same in I. 1 / 2 ~N_2(~g)+O_2(~g) arrow NO_2(~g) II. Xe(g)+2 ~F_2(~g) arrow XeF_4(~g) III. N_2(~g)+O_3(~g) arrow N_2 O_3(~g) IV.

Olympiad workbook Solution View → 18

The change in internal energy (Δ U) for the reaction H_2(~g)+Br_2(~g) arrow 2 HBr(l) when 2.0 moles each of Br_2(~g) and H_2(~g) react is (H_2(~g)+Br_2(~g) arrow 2 HBr(~g) ; Δ H_

Olympiad workbook Solution View → 19

At 298 K , the standard free energies of formation of cis- and trans-1,2-dichloroethene are 41.549 kJ and 33.235 kJ respectively. The most appropriate mol ratio of trans- and cis

Olympiad workbook Solution View → 20

A student adds ' x ' g of iron (Fe) powder to dil. HCl and measures the work done by the reaction between HCl and the added Fe to be 1000 J . If the experiment was conducted at a

Olympiad workbook Solution View → 21

The figure represents the processes AB, BC and CA undertaken by a certain mass of an ideal gas. Along the path AB , the gas is isothermally compressed with release of 800 J heat

Olympiad workbook Solution View → 22

Which of the following properties may have positive values of Δ H ? (i) Lattice enthalpy (ii) Hydration enthalpy

Olympiad workbook Solution View → 23

From the following data aligned & 2 CH_6 ~N_2(ℓ)+5 O_2(~g) arrow 2 ~N_2(~g)+2 CO_2(~g)+6 H_2 O(~g)(Δ H_ r ^0=-2606 ~kJ) and & H_2 O(ℓ) arrow H_2 O(~g)(Δ H_ v ^0=44 ~kJ ~mol^ -1 )

Olympiad workbook Solution View → 24

Silanes are silicon hydrides of general formula Si_ n H_ 2 n+2 and have several applications. From the data given below, the bond dissociation enthalpy of Si-Si bond can be

Olympiad workbook Solution View → 25

2.0 moles of an ideal gas expands isothermally (27^ ^ ^ ∘ C) and reversibly from a pressure of 1 bar to 10 bar. The heaviest mass that can be lifted through a height of 10 m by

Olympiad workbook Solution View → 26

Given Δ_r H^ ^ ^ ∘ =-54.08 ~kJ ~mol^ -1 and Δ_r S^ ^ ^ ∘ =10.0 ~J ~mol^ -1 at 25^ ^ ^ ∘ C , the value of _ 10 K for the reaction A leftharpoons B is

Olympiad workbook Solution View → 27

For the conversion CCl_4(l) arrow CCl_4(~g) at 1 bar and 350 K , the correct set of thermodynamic parameters is (Boiling point of CCl_4 is 77^ ^ ^ ∘ C )

Olympiad workbook Solution View → 28

For the following spontaneous process H_2 O_ (l) arrow H_2 O_ (s) at 268 K , which of the following is true?

Olympiad workbook Solution View → 29

Three samples of 100 g of water (samples I, II and III), initially kept at 1 atm pressure and 298 K were given the following treatments. Sample I was heated to 320 K and cooled to

Olympiad workbook Solution View → 30

Standard molar enthalpy of formation of CO_2(~g) is equal to

Olympiad workbook Solution View → 31

Hydrazine used in rocket fuels can be obtained by the reaction of ammonia and hydrogen peroxide according to the following equation 2 NH_3(~g)+H_2 O_2(l) arrow N_2 H_4(l)+2 H_2

Olympiad workbook Solution View → 32

Which reaction is spontaneous at all temperatures at standard pressure and concentration?

Olympiad workbook Solution View → 33

Silanes are silicon hydrides of general formula Si_ n H_ 2 n+2 and have several applications. From the data given below, the bond dissociation enthalpy of Si-Si bond can be

Olympiad workbook Solution View → 34

At constant volume, 6.0 mol of H_2 gas at 0^ ^ ^ ∘ C and 100 kPa was heated to 250 kPa . The molar heat of H_2 at constant pressure (C_ P )=28.9 ~J ~mol^ -1 . ( assume that the

Olympiad workbook Solution View → 35

The daily energy requirement of a teenager is 7800 kJ . As calculated from the data given in the table below, the amount of glucose he has to consume (g) per day assuming that the

Olympiad workbook Solution View → 36

The lattice enthalpy and enthalpy of solution in water for solid NaCl are 753 kJ mol^ -1 and 5 ~kJ ~mol^ -1 respectively(Fig above). If the solution enthalpies of Na^ + and Cl^

Olympiad workbook Solution View → 37

For the reaction 4 NO_2(~g)+O_2(~g) arrow 2 ~N_2 O_5(~g), Δ H_ reaction =-112 ~kJ . If the N_2 O_5 is assumed to be formed in the reaction as a solid, Δ H_ reaction will be (Δ H_

Olympiad workbook Solution View → 38

At 298 K , change in internal energy for the complete combustion of fullerene, C_ 60 (~s) , an allotrope of carbon, and the enthalpy of formation of CO_2(~g) are -25970 ~kJ ~mol^

Olympiad workbook Solution View → 39

2.0 L of N_2 gas kept at 25^ ^ ^ ∘ C and 5 atm pressure were expanded isothermally against a constant pressure of 1 atm until the pressure of the gas reaches 1 atm . Assuming

Olympiad workbook Solution View → 40

The work done (kJ) in the irreversible isothermal compression of 2.0 moles of an ideal gas from 1 bar to 100 bar at 25^ ^ ^ ∘ C at constant external pressure of 500 bar is

Olympiad workbook Solution View → 41

The normal boiling point and Δ H_ vap of a liquid ' X ' are 400 K and 40 ~kJ ~mol^ -1 respectively. Assuming Δ H_ vap to be constant, which of the following is correct? I. Δ S_

Olympiad workbook Solution View → 42

The change in internal energy (Δ U) for the reaction H_2(~g)+Br_2(~g) arrow 2 HBr(l) when 2.0 moles each of Br_2(~g) and H_2(~g) react is (H_2(~g)+Br_2(~g) arrow 2 HBr(~g) ; Δ H_

Olympiad workbook Solution View → 43

2.0 moles of an ideal gas expands isothermally (27^ ^ ^ ∘ C) and reversibly from a pressure of 1 bar to 10 bar. The heaviest mass that can be lifted through a height of 10 m by

Olympiad workbook Solution View → 44

At 298 K , the standard free energies of formation of cis- and trans-1,2-dichloroethene are 41.549 kJ and 33.235 kJ respectively. The most appropriate mol ratio of trans- and cis

Olympiad workbook Solution View → 45

Following is the P vs V plot of a cyclic process 1 arrow 2,2 arrow 3,3 arrow 4,4 arrow 1 , denoted as I, II, III and IV respectively for a system of one mole of an ideal gas.

Olympiad workbook Solution View → 46

From the following data aligned & 2 CH_6 ~N_2(ℓ)+5 O_2(~g) arrow 2 ~N_2(~g)+2 CO_2(~g)+6 H_2 O(~g)(Δ H_ r ^0=-2606 ~kJ) and & H_2 O(ℓ) arrow H_2 O(~g)(Δ H_ v ^0=44 ~kJ ~mol^ -1 )

Olympiad workbook Solution View → 47

Heat of reaction and heat of formation will be the same in I. 1 / 2 ~N_2(~g)+O_2(~g) arrow NO_2(~g) II. Xe(g)+2 ~F_2(~g) arrow XeF_4(~g) III. N_2(~g)+O_3(~g) arrow N_2 O_3(~g) IV.

Olympiad workbook Solution View → 48

Which of the following properties may have positive values of Δ H ? (i) Lattice enthalpy (ii) Hydration enthalpy

Olympiad workbook Solution View → 49

The figure represents the processes AB, BC and CA undertaken by a certain mass of an ideal gas. Along the path AB , the gas is isothermally compressed with release of 800 J heat

Olympiad workbook Solution View → 50

A student adds ' x ' g of iron (Fe) powder to dil. HCl and measures the work done by the reaction between HCl and the added Fe to be 1000 J . If the experiment was conducted at a

Olympiad workbook Solution View →
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Main Thermodynamics (C) list

The larger JEE Thermodynamics (C) list is under Chemistry (574 questions).

Related JEE NSEC chapters

Some Basic Concepts of Chemistry (60)Electrochemistry (52)Structure of Atom (50)General Organic Chemistry (44)Chemical Kinetics (42)Chemical Bonding and Molecular Structure (34)Coordination Compounds (33)Hydrocarbons (29)Solid State (22)Ionic Equilibrium (20)Alcohols Phenols and Ethers (19)Solutions (18)

Thermodynamics (C) in other exams

NEET Thermodynamics (C) (730)BITSAT Thermodynamics (C) (34)