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Thermodynamics (C) — BITSAT Chemistry PYQs

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

Thermodynamics (C) — BITSAT Chemistry PYQs

What would be the amount of heat absorbed in the cyclic process shown below?

The bond dissociation energy of X₂, Y₂ and X Y are in the ratio of 1: 0.5: 1 . H for the formation of X Y is -200 ~kJ / mol . The bond dissociation energy of X₂ will be

Which of the following relation is not correct?

The standard Gibbs energy ( G^0 ) for the following reaction is aligned & A ( s )+ B ²⁺( aq ) A ²⁺( aq )+ B ( s ), K _ c =10¹² at & 25^ C aligned ( K _c= . equilibrium constant )

The combustion of benzene (L) gives CO ₂( ~g ) and H ₂ O (L) . Given that heat of combustion of benzene at constant volume is -3263.9 ~kJ ~mol ⁻ ^1 at 25^ C ; heat of combustion (i

Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following:

Given that bond energies of H - H and Cl - Cl are 430 ~kJ ~mol ⁻¹ and 240 ~kJ ~mol ⁻¹ respectively and H _ f for HCl is -90 ~kJ ~mol ⁻¹ , bond enthalpy of HCl is

If enthalpies of formation of C ₂ H ₄( ~g ), CO ₂( ~g ) and H ₂ O ( l ) at 25^ C and 1 ~atm pressure are 52,394 and -286 ~kJ / mol respectively, the change in enthalpy for combusti

Standard entropy of X₂, Y₂ and X Y₂ are 60,40 and 50 JK ⁻¹ ~mol ⁻¹ , respectively. For the reaction, 1 2 X₂+ 3 2 Y₂ X Y₃, H=-30 ~kJ , to be at equilibrium, the temperature will be

In an adiabatic process, no transfer of heat takes place between system and surrounding. Choose the correct option for free expansion of an ideal gas under adiabatic condition from

Work out the heat change (cal) when 40 ~g of He gas at 27^ C undergoes isothermal and reversible compression from initial pressure of 1 ~atm to 10 ~atm ( R =2 cal K ⁻¹ ~mol ⁻¹ ) .

For which one of the processes represented by the following equations the enthalpy (heat) change is likely to be negative

Acyclicprocess ABCD is shown in P-V diagram for an ideal gas. Which of the following diagram represents the same process?

For the combustion reaction at 298 ~K 2 Ag ( s )+1 / 2 O ₂( ~g ) 2 Ag ₂ O ( s ) Which of the following alternatives is correct?

The heat of reaction for C 10 H 8 s + 12 O 2 g &#10230; 10 CO 2 g + 4 H 2 O ( l ) at constant volume is - 1228 . 2 kcal at 25 0 C . The heat of reaction at constant pressure and sa

Enthalpy of combustion of methane and ethane are - 210 k cal / mol and - 368 k cal / mol respectively. The enthalpy of combustion of decane is

When the heat of a reaction at constant pressure is - 25 &#215; 10 - 3 cal and entropy change for the reaction is 7 . 4 cal deg - 1 , it is predicted that the reaction at 25 0 C is

Which of the following reactions does not involve absorption of energy? I. O g + e - &#10230; O - g II. S g + e - &#10230; S - g III. O - g + e - &#10230; O 2 - g IV. Cl g + e - &#

Which of the following show an increase in entropy? I. Boiling of water II. Melting of ice III. Freezing of water IV. Formation of hydrogen gas from water

For a particular reversible reaction at temperature T, H and S were found to be both +ve. If T_ e is the temperature at equilibrium, the reaction would be spontaneous when

Given F ( g )+ e ⁻ F ⁻( g ) (Electron gain enthalpy) Li ⁺( g )+ F ⁻( g ) LiF ( s ) -1047 Li ( s )+ 1 2 ~F ₂( ~g ) LiF ( s ) -617 Based on data provided, the value of electron gain

Which law of the thermodynamics helps in calculating the absolute entropies of various substances at different temperatures?

A spontaneous reaction is impossible if

The enthalpy of sublimation of aluminium is 330 kJ / mol . Its Ist, II ^ nd and III ^ rd ionization enthalpies are 580,1820 and 2740 ~kJ respectively. How much heat has too be supp

If the enthalpy of vaporization of water is 186.5 kJmol ⁻¹ , the entropy if its vaporization will be:

The heats of neutralisation of CH ₃ COOH , HCOOH , HCN and H ₂ ~S are -13.2,-13.4,-2.9 and -3.8 kCal per equivalent respectively. Arrange the acids in increasing order of acidic st

For the dissociation reaction, H ₂( ~g ) 2 H ( g ) H =162 Kcal heat of atomisation of H is

The enthalpy of combustion of 2 moles of benzene at 27^ C differs from the value determined in bomb calorimeter by

In which of the following reactions, standard entropy change ( S ^ ) is positive and standard Gibb's energy change ( G ^ ) decreases sharply with increasing temperature?

What is the free energy change, G , when 1.0 mole of water at 100^ C and 1 atm pressure is converted into steam at 100^ C and 1 ~atm . pressure?

At a constant volume the specific heat of a gas is 0.075 and its molecular weight is 40 . The gas is:

Which one of the following is correct regarding H :

One mole of an ideal gas at 300 ~K is expanded isothermally from an initial volume of 1 litre to 10 litres. The E for this process is ( R =2 . cal . mol ⁻¹ ~K ⁻¹ )

At 25^ C and 1 bar which of the following has a non-zero H _ f ^ ?

The heat of reaction for C 10 H 8 s + 12 O 2 g ⟶ 10 CO 2 g + 4 H 2 O ( l ) at constant volume is - 1228 . 2 kcal at 25 0 C . The heat of reaction at constant pressure and sa

When the heat of a reaction at constant pressure is - 25 × 10 - 3 cal and entropy change for the reaction is 7 . 4 cal deg - 1 , it is predicted that the reaction at 25 0 C is

Which of the following reactions does not involve absorption of energy? I. O g + e - ⟶ O - g II. S g + e - ⟶ S - g III. O - g + e - ⟶ O 2 - g IV. Cl g + e - &#