Chemical Thermodynamics — practice questions
124 curated practice questions from Chemical Thermodynamics (Chemistry JEE Advanced, NTA Exams) — 83 hard, 41 medium. Every question includes the final answer free; step-by-step worked solutions with a free account.
- The magnitudes of enthalpy changes for irreversible adiabatic expansion of a gas from 1L to 2L is ∆H 1 and for…
- One mole of a non-ideal gas undergoes a change of state (2.0 atm, 3.0 L, 95 K) → (4.0 atm, 5.0 L, 245 K) with a change…
- For the process: H 2 O ( l ) → H 2 O ( g ) at T = 100 °C and 1 atmosphere pressure, the correct choice is
- 10 mole of an ideal gas is heated at constant pressure of one atmosphere from 27 o C to 127 o C.If C_ v, m =21.686+10^…
- Heat of neutralization of a strong dibasic acid in dilute solution by NaOH is nearly
- Calculate the enthalpy change when 1.0 g of water is frozen at 0 0 C ( H _ f ^ 0 = 1.435 kcal mol –1 )
- Standard Gibb’s energy of reaction ( _ r G ^ ) at a certain temperature can be computed as _ r G^ o = _ r H^ o -T _ r…
- The normal boiling point of a liquid ‘X’ is 400 K. Which of the following statement is true about the process X ( l ) X…
- A sample containing 1.0 mol of an ideal gas is expanded isothermally and reversily to ten time of its original volume…
- A liquid which is confined inside an adiabatic piston is suddenly taken from state 1 to state 2 by a single stage…
- In thermodynamics the P-V work done is given by w =- dVP _ ext For a system undergoing a particular process, the work…
- Observe the following graphic representation of four basic thermodynamic processes. If the ratio C _ P C _ V =1.30 …
- What is the change in molar entropy of helium in the following process ? 1 He (298 K, 1 bar) → 1 He (100 K, 10 bar)
- Assertion (A) : A reversible process produces more work than the same process if it is carried out irreversibly for the…
- Observe the following graphic representation of four basic thermodynamic processes. Which of the following is true for…
- 2 mole of an ideal monoatomic gas undergoes a reversible process for which PV 2 = C. The gas is expnaded from initial…
- An ideal gas undergoes a four step cycle as shown in the P - V diagram. During this cycle, heat is absorbed by the gas…
- In thermodynamics, a process is called reversible when
- Statement-1 : For every chemical reaction at equilibrium, standard Gibbs energy of reaction is zero. Statement-2 : At…
- A certain gas in expanded from (lL, 10 atm) to (4L, 5 atm) against a constant external pressure of 1 atm. If the…
- Assertion (A) : There is a natural asymmetry between converting work to heat and converting heat to work. Reason (R) …
- The reversible expansion of an ideal gas under adiabatic and isothermal conditions is shown in the figure. Which of the…
- Heat of neutralisation of NaOH and HCl is –57.46 kJ/equivalent. The heat of ionisation of water will be :
- Assertion (A) : There is no change in internal energy for an ideal gas at constant temperature. Reason (R) : Internal…
- The difference between heat of reaction at constant pressure and constant volume for the reaction: 2C 6 H 6( l ) + 15O…
- In thermodynamics, a process is called reversible when (2001)
- Assertion (A) : When a salt dissolves in water, the temperature of solution decreases. Reason (R) : Energy equal to…
- The bond energy of H 2 is 104.3 kcal/mol. It means that
- For the real gases reaction 2CO (g) + O 2 (g) → 2CO 2 (g) ∆H = –560 kJ. In 10 litre rigid vessel at 500 K the initial…
- Standard Gibb’s energy of reaction ( _ r G ^ ) at a certain temperature can be computed as _ r G^ o = _ r H^ o -T _ r…
- Given are the following entropy values at 298 K and 1 atm: H 2 (g) = 130.6 J K –1 mol –1 ; Cl 2 (g) = 223.0 J K –1 mol…
- For an ideal gas, consider only P-V work in going from an initial state X to the final state Z . The final state Z can…
- In the figure a container is shown to have a movable (without friction)piston on top. The container and the piston are…
- ∆ r H 0 for solid-to-liquid transition for proteins A and B are 2.73 kcal mol –1 and 3.03 kcal mol –1 . The two melting…
- An ideal gas at constant temperature and pressure expands, then its
- When one mole of monoatomic ideal gas at TK undergoes adiabatic change under a constant external pressure of 1 atm…
- The D H ° for CO 2( g ) , CO ( g ) and H 2 O ( g ) are –393.5, –110.5 and –241.8 kJ mol –1 respectively. The standard…
- The amount of energy required to break a bond is same as the amount of energy released when the same bond is formed. In…
- Energy required to dissociate 4g of gaseous hydrogen into free gaseous atoms is 208 kcal at 25°C. The bond energy of H…
- An ideal gas in a thermally insulated vessel at internal pressure = P 1 , volume = V 1 and absolute temperature = T 1…
- The enthalpy of combustion for octane (a major component of gasoline) is – 47.8 kJ/g. How much energy is released by…
- The mathematical expression for the standard enthalpy of sublimation is given by
- Two moles of ideal helium gas are in a rubber balloon at 30°C. The balloon is fully expandable and can be assumed to…
- S = H ~T holds good for
- Two moles of an ideal gas is expanded isothermally and reversibly from 1 litre to 10 litre at 300 K. The enthalpy…
- ∆H vap = 30 kJ/mol and ∆S vap = 75 Jmol –1 K –1 . Find temperature of vapour, at one atmosphere. (2004)
- The value of log 10 K for a reaction A B is (Given: D H r ° (298 K) = –54.07 kJ mol –1 , D H r ° (298 K) = 10 J K –1…
- The free-energy change for the conversion of maleate into fumarate is 3.0 kJ. In metabolism, this reaction is coupled…
- The standard state Gibbs free energies of formation of C (graphite) and C (diamond) at T = 298 K are Δ f G °[C…
- Assertion (A) : When internal energy of reactants becomes greater than that of products the energy is given out to the…
- In a given process on an ideal gas dW = 0 and dQ < 0. Then for the gas
- Determine C–C and C–H bond enthalpy (in kJ/mol) Given: _ f H ^ ( C _ 2 H _ 6 , ~g ) = –85 kJ/mol _ f H ^ ( C _ 3 H _ 8…
- Choose the reaction(s) from the following options, for which the standard enthalpy of reaction is equal to the standard…
- Which of the following reactions defines ∆Hº f ? (2003)
- Identify the intensive quantities from the following
- A monoatomic ideal gas undergoes a process in which the ratio of p to V at any instant is constant and equals to 1…
- 1 mole of an ideal gas A (C v,m = 3 R) and 2 mole of an ideal gas B ( C _ v , ~m = 3 2 R ) are taken in a container and…
- In which case of mixing of a strong acid and strong base, each of 1N concentration, temperature increase is the highest…
- Choose the reaction(s) from the following options, for which the standard enthalpy of reaction is equal to the standard…
- The specific heat of a gas at constant volume is 0.075 cal/g. Predict the atomicity of the gas. Molar mass of gas is 40…
- Assertion (A) : Enthalpy of neutralization of CH 3 COOH by NaOH is less than that of HCl by NaOH. Reason (R) : Enthalpy…
- For a reaction taking place in a container in equilibrium with its surroundings, the effect of temperature on its…
- One mole of a monatomic ideal gas goes through a thermodynamic cycle, as shown in the volume versus temperature ( V-T )…
- If enthalpy of hydrogenation of C 6 H 6 ( l ) into C 6 H 12 ( l ) is –205 kJ and resonance energy of C 6 H 6 ( l ) is…
- A gas is enclosed in a cylinder with a movable frictionless piston. Its initial thermodynamic state at pressure P i =…
- The enthalpy of neutralization of a strong acid by a strong base is –57.32 kJ mol –1 . The enthalpy of formation of…
- The standard state Gibbs free energies of formation of C(graphite) and C(diamond) at T = 298 K are _ f G ^…
- Calculate _ f G ^ for (NH 4 Cl, s) at 310 K. Given : _ f H ^ (NH 4 Cl, s)= –314.5 kJ/mol; _ r C_ p =0 S _ N _ 2 ( ~g )…
- Molar heat capacity of water in equilibrium with ice at constant pressure is
- What is the bond enthalpy of Xe–F bond? array r XeF _ 4 Xe ^ + ( g )+ F ^ - ( g )+ F _ 2 ( ~g )+ F ( ~g ) ; _ 1 H =292…
- A reversible cyclic process for an ideal gas is shown below, Here, P, V, and T are pressure, volume and temperature…
- The species which by definition has zero standard molar enthalpy of formation at 298 K is
- When heat is supplied to an ideal gas in an isothermal process, the
- The standard enthalpies of formation of CO 2( g ) , H 2 O ( l ) and glucose ( s ) at 25 °C are –400 kJ/mol, –300 kJ/mol…
- The difference between heats of reaction at constant pressure and constant volume for the reaction 2C 6 H 6 (l ) + 15O…
- An ideal gas in a thermally insulated vessel at internal pressure=P 1 , volume = V 1 , and absolute temperature =T 1…
- array llc Given & _ f H ^ 0 ( ~kJ / mol ) & S _ m ^ 0 ( ~J / k / mol ) CCl _ 4 (l) & -135.4 & 215.4 CCl _ 4 ( ~g ) &…
- Heat released in neutralization of strong acid and strong base is 13.4 kcal/mol. The heat released on neutralization of…
- Among the following, the intensive property is (properties are).
- 0.5 mole each of two ideal gases A ( C _ v , ~m = 5 2 R ) and B (C v,m = 3R) are taken in a container and expanded…
- An ideal gas initially at P 1 , V 1 is expanded to P 2 , V 2 and then compressed adiabatically to the same volume V 1…
- The ∆G for the following reactions at 800 0 C are given as S 2 (s) + 2O 2 (g) → 2SO 2 (g); ∆G = – 544 kJ 2Zn (s) + S 2…
- The figure below shows the variation of specific heat capacity ( C ) of a solid as a function of temperature ( T ). The…
- In thermodynamics, the P − V work done is given by w=- d V P_ e x t For a system undergoing a particular process, the…
- The value of log 10 K for a reaction A ⇌ B is (Given : ∆ r Hº 298K = – 54.07 kJ mol –1 , ∆ r Sº 298 K = 10 JK –1 mol –1…
- Standard molar enthalpy of formation of CO 2 is equal to
- A gas expands adiabatically at constant pressure such that T ∝ V –1/2 . The value of γ (C p,m /C v,m ) of the gas will…
- One mole of a non-ideal gas undergoes a change of state (2.0 atm, 3.0 L, 95 K) → (4.0 atm, 5.0 L, 245 K) with a change…
- For an endothermic reaction, where ∆H represents the enthalpy of the reaction in kJ/mol, the minimum value for the…
- Consider the reaction below at 298 K : C (graphite) + 2H 2 (g) → CH 4 (g) ∆ f Hº (kJ/mol) = 74.9 S 0 m (J/K/mol) + 5.6…
- For the process H 2 O ( l ) (1 bar, 273 K) → H 2 O(g) (1 bar, 373 K), the correct set of themodynamic parameters is…
- Spontaneous adsorption of a gas on solid surface is an exothermic process because (2004)
- One mode of an ideal gas at 300 K in thermal contact with surroundings expands isothermally from 1.0 L to 2.0 L against…
- A sample of an ideal gas is taken through the cyclic process ABCA as shown in figure. It absorbs, 40 J of heat during…
- The enthalpy of formation of NH 3 (g) at constant pressure and 350 0 C temperature is –50.0 kJ mol –1 . What will be…
- The lattice energy of solid NaCl is 180 kcal per mol. The dissolution of the solid in water in the form of ions is…
- When one mole of monoatomic ideal gas at T K undergoes adiabatic change under a constant external pressure of 1 atm…
- The molar heat capacities at constant pressure (assumed constant with respect to temperature) for A, B and C are in…
- Assertion (A) : Heat of neutralization of HF is more than that of HC l by NaOH. Reason (R) : HC l is stronger acid than…
- Statement-1 : The heat absorbed during the isothermal expansion of an ideal gas against vaccum is zero. Statement-2 …
- Mg(s) + 2HCl(aq.) → MgCl 2 (aq) + H 2 (g); ∆ r H 0 = – 467 kJ/mol MgO (s) + 2HCl (aq) → MgCl 2 (aq) + H 2 O ( l ) ; ∆ r…
- The direct conversion of A to B is difficult, hence it is carried out by the following shown path Given ∆S (A → C) = 50…
- For the pocess H _ 2 O ( ) H _ 2 O ( ~g ) at T = 100°C and 1 atmosphere pressure, the correct choice is (2014)
- An ideal gas is expanded from (p 1 , V 1 , T 1 ) to (p 2 , V 2 , T 2 ) under different conditions. The correct…
- Assertion (A) : The extensive properties of a single pure substance will not only depend upon the number of moles of…
- For the process H 2 O ( l ) (1 bar, 373 K) → H 2 O ( g ) (1 bar, 373 K), the correct set of thermodynamic parameters is
- Given that, H _ f ^ 0 (CO 2 , g) = – 393.509 kJ mol –1 , H _ f ^ 0 (H 2 O, l ) = – 285.830 kJ mol – 1 , H _ f ^ 0 (C 2…
- At 5 × 10 5 bar pressure, density of diamond and graphite are 3 g/cc and 2 g/cc respectively, at certain temperature…
- For the allotropic change represented by the equation C (diamond) → (graphite) the enthalpy change is ∆H = – 1.89 kJ If…
- The enthalpy of vapourisation of liquid is 30 kJ mol –1 and entropy of vapourisation is 75 J mol –1 K. The boiling…
- The enthalpy of reaction CH 4 (g) + O 2 (g) → CH 3 OH( L ) is negative. If enthalpy of combustion of CH 4 and CH 3 OH…
- Which of the reaction defines Δ H ° f ?
- 70 calorie of heat are required to raise the temperature of 2 mole of an ideal gas at constant pressure from 30°C to…
- One mole of an ideal gas in initial state A undergoes a cyclic process ABCA , as shown in the figure. Its pressure at A…
- Assertion (A) : For every chemical reaction at equilibrium standard Gibbs’ energy of reaction is zero. Reason (R) : At…
- For which change D H ≠ D E ?
- Assertion (A) : Entropy change in reversible adiabatic expansion of an ideal gas is zero. Reason (R) : The increase in…
- An ideal gas is filled in a closed rigid and thermally insulated container. A coil of 100 Ω resistor carrying current 1…
- The ∆Hº f for CO 2 (g), CO(g) and H 2 O (g) are – 393.5, – 110.5 and – 241.8 kJ mol –1 respectively. The standard…
- An ideal gas undergoes a reversible isothermal expansion from state I to stable II followed by a reversible adiabatic…
- Observe the following graphic representation of four basic thermodynamic processes. Which of the following is not true…
- The correct option(s) about entropy ( S ) is(are) [ R = gas constant, F = Faraday constant, T = Temperature]
- Assertion (A) : The heat absorbed during the isothermal expansion of an ideal gas against vacuum is zero. Reason (R) …
- 2 moles of an ideal gas expanded isothermally and reversibly from 1 L to 10 L at 300 K. What is the enthalpy change ?…