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Thermodynamics (C) — JEE Main & Advanced NSEC PYQs

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

50 questionsNSECSolutions on every page
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 heat cap

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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 ) N ₂ H ₄( l )+2 H ₂ O

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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

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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

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

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Standard molar enthalpy of formation of CO ₂( ~g ) is equal to

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For the conversion CCl ₄( l ) CCl ₄( ~g ) at 1 bar and 350 K , the correct set of thermodynamic parameters is (Boiling point of CCl ₄ is 77^ C )

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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

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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 ideal behav

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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

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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 ⁻ are i

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For the following spontaneous process H ₂ O _ ( l ) H ₂ O _ ( s ) at 268 K , which of the following is true?

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The normal boiling point and H _ vap of a liquid ' X ' are 400 K and 40 ~kJ ~mol ⁻¹ respectively. Assuming H _ vap to be constant, which of the following is correct? I. S _ vap >10

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For the reaction 4 NO ₂( ~g )+ O ₂( ~g ) 2 ~N ₂ O ₅( ~g ), H _ reaction =-112 ~kJ . If the N ₂ O ₅ is assumed to be formed in the reaction as a solid, H _ reaction will be ( H _ su

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

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

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Heat of reaction and heat of formation will be the same in I. 1 / 2 ~N ₂( ~g )+ O ₂( ~g ) NO ₂( ~g ) II. Xe ( g )+2 ~F ₂( ~g ) XeF ₄( ~g ) III. N ₂( ~g )+ O ₃( ~g ) N ₂ O ₃( ~g ) I

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The change in internal energy ( U ) for the reaction H ₂( ~g )+ Br ₂( ~g ) 2 HBr (l) when 2.0 moles each of Br ₂( ~g ) and H ₂( ~g ) react is ( H ₂( ~g )+ Br ₂( ~g ) 2 HBr ( ~g ) ;

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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-

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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

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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 t

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

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From the following data aligned & 2 CH ₆ ~N ₂( )+5 O ₂( ~g ) 2 ~N ₂( ~g )+2 CO ₂( ~g )+6 H ₂ O ( ~g ) ( H _ r ^0=-2606 ~kJ ) and & H ₂ O ( ) H ₂ O ( ~g ) ( H _ v ^0=44 ~kJ ~mol ⁻¹

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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 de

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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 the work

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

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For the conversion CCl ₄( l ) CCl ₄( ~g ) at 1 bar and 350 K , the correct set of thermodynamic parameters is (Boiling point of CCl ₄ is 77^ C )

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For the following spontaneous process H ₂ O _ ( l ) H ₂ O _ ( s ) at 268 K , which of the following is true?

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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

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Standard molar enthalpy of formation of CO ₂( ~g ) is equal to

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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 ) N ₂ H ₄( l )+2 H ₂ O

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

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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 de

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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 heat cap

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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

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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 ⁻ are i

Olympiad workbook Solution View → 37

For the reaction 4 NO ₂( ~g )+ O ₂( ~g ) 2 ~N ₂ O ₅( ~g ), H _ reaction =-112 ~kJ . If the N ₂ O ₅ is assumed to be formed in the reaction as a solid, H _ reaction will be ( H _ su

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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 ideal behav

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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

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The normal boiling point and H _ vap of a liquid ' X ' are 400 K and 40 ~kJ ~mol ⁻¹ respectively. Assuming H _ vap to be constant, which of the following is correct? I. S _ vap >10

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The change in internal energy ( U ) for the reaction H ₂( ~g )+ Br ₂( ~g ) 2 HBr (l) when 2.0 moles each of Br ₂( ~g ) and H ₂( ~g ) react is ( H ₂( ~g )+ Br ₂( ~g ) 2 HBr ( ~g ) ;

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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 the work

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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 2,2 3,3 4,4 1 , denoted as I, II, III and IV respectively for a system of one mole of an ideal gas. Assume that there is heat exc

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From the following data aligned & 2 CH ₆ ~N ₂( )+5 O ₂( ~g ) 2 ~N ₂( ~g )+2 CO ₂( ~g )+6 H ₂ O ( ~g ) ( H _ r ^0=-2606 ~kJ ) and & H ₂ O ( ) H ₂ O ( ~g ) ( H _ v ^0=44 ~kJ ~mol ⁻¹

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Heat of reaction and heat of formation will be the same in I. 1 / 2 ~N ₂( ~g )+ O ₂( ~g ) NO ₂( ~g ) II. Xe ( g )+2 ~F ₂( ~g ) XeF ₄( ~g ) III. N ₂( ~g )+ O ₃( ~g ) N ₂ O ₃( ~g ) I

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

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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 t

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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

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