Thermodynamics — practice questions
80 curated practice questions from Thermodynamics (Chemistry Class 11, CBSE) — 80 easy. Every question includes the final answer free; step-by-step worked solutions with a free account.
- Study the given graph and choose the correct option.
- A reaction proceeds through two paths I and II to convert X → Z . What is the correct relationship between Q , Q 1 and…
- For the reaction : H 2( g ) + Cl 2( g ) → 2HCl; D H = – 44 kcal What is the enthalpy of decomposition of HCl?
- The total entropy change (Δ S total ) for the system and surrounding of a spontaneous process is given by
- If enthalpy of an overall reaction X → Y along one route is Δ r H and Δ r H 1 , Δ r H 2 , Δ r H 3 ……… representing…
- For the reaction given below the values of standard Gibbs free energy of formation at 298 K are given. What is the…
- Study the figure given below and mark the correct expression. array l X Y_ (g) H_ golm ^ X_ ( aq ) ^ + +Y_ ( aq ) ^ …
- Two reactions are given below : (i) CO _ (g) + 1 2 O _ 2(g) CO _ 2(g) (ii) Which of the following statements is true?
- What is the work done when 1 mole of a gas expands isothermally from 25 L to 250 L at a constant pressure of 1 atm and…
- Which thermochemical process is shown by the following figure?
- In a reaction P + Q → R + S , there is no change in entropy. Enthalpy change for the reaction ( D H ) is 12 kJ mol –1 …
- A reaction is at equilibrium at 100°C and the enthalpy change for the reaction is 42.6 kJ mol –1 . What will be the…
- The amount of heat evolved when 0.50 mole of HCl is mixed with 0.30 mole of NaOH solution is
- One word answer is given for the following definitions. Mark the one which is incorrect.
- The heat of combustion of C, S and CS 2 are –393.3 kJ, –293.7 kJ and –1108.76 kJ. What will be the heat of formation of…
- Which of the following relationships is not correct for the relation between Δ H and Δ U ?
- The work done during the expansion of a gas from 4 dm 3 to 6 dm 3 against a constant external pressure of 3 atm is ( 1…
- The enthalpy of formation of ammonia when calculated from the following bond energy data is ( B . E . of N – H, H – H…
- The value for Δ U for the reversible isothermal evaporation of 90 g water at 100°C will be (Δ H evap of water = 40.8 kJ…
- According to the first law of thermodynamics, Δ U = q + W. In special cases the statement can be expressed in different…
- For a reaction : X → Y + Z Absolute entropies are X = 120 J K –1 mol –1 , Y = 213.8 J K –1 mol –1 and Z = 197.9 J K –1…
- For reversible reaction : X ( g ) + 3 Y ( g ) 2 Z ( g ) ; Δ H = – 40 kJ Standard entropies of X , Y and Z are 60, 40…
- Enthalpy change for the process, H 2 O(ice) H 2 O(water) is 6.01 kJ mol –1 . The entropy change of 1 mole of ice at its…
- Match the column I with column II and mark the appropriate choice. Column I Column II (A) H 2( g ) + Br 2( g ) → 2HBr (…
- Which of the following reactions will have the value of enthalpy of neutralisation as –57.1 kJ mol –1 ?
- The entropy change can be calculated by using the expression, . When water freezes in a glass beaker,
- For a reaction to be spontaneous at any temperature, the conditions are
- What will be the signs of D H and D S when NaOH is dissolved in water?
- How much heat is evolved if 3.2 g of methane is burnt and if the heat of combustion of methane is –880 kJ mol –1 ?
- Δ H for the reaction, OF 2 + H 2 O → O 2 + 2HF ( B . E . of O F, O H, H F and O O are 44, 111, 135 and 119 kcal mol –1…
- The heat of combustion of ethane and benzene is –1560 and –3268 kJ mol –1 respectively. Which of two has higher…
- In the following question a statement of assertion is followed by a statement of reason. Mark the correct choice…
- In the following question a statement of assertion is followed by a statement of reason. Mark the correct choice…
- Match the following columns and mark the appropriate choice. Column I Column II (A) Exothermic (i) Δ H = 0, Δ E = 0 (B)…
- Dissolution of ammonium chloride in water is an endothermic reaction, yet it is a spontaneous process. This is due to…
- The equilibrium constant for a reaction is 10. What will be the value of D G ° at 300 K?
- Read the following statements regarding spontaneity of a process and mark the appropriate choice. (i) When enthalpy…
- In thermodynamics, which one of the following properties is not an intensive property?
- What will be the enthalpy of combustion of carbon to produce carbon monoxide on the basis of data given below: C ( s )…
- The enthalpy of solution of sodium chloride is 4 kJ mol –1 and its enthalpy of hydration of ions is –784 kJ mol –1 …
- The statement “ The change of enthalpy of a chemical reaction is same whether the reaction takes place in one or…
- Match the column I with column II and mark the appropriate choice. Column I Column II (A) State function (i) At…
- Bond energies of few bonds are given below : Cl Cl = 242.8 kJ mol –1 , H Cl = 431.8 kJ mol –1 , O H = 464 kJ mol –1 , =…
- What will be the enthalpy change of conversion of graphite into diamond? Given C graphite , D comb H = –391.25 kJ; C…
- Match the column I with column II and mark the appropriate choice. Column I Column II (A) CH 4( g) + 2O 2( g) → CO 2(…
- The molar heat capacity of water at constant pressure, C P is 75 J K –1 mol –1 . When 10 kJ of heat is supplied to 1 kg…
- Which of the following expressions is correct to calculate enthalpy of a reaction?
- What will be the work done when one mole of a gas expands isothermally from 15 L to 50 L against a constant pressure of…
- Formation of ammonia is shown by the reaction, N 2( g ) + 3H 2( g ) → 2NH 3( g ) , D r H ° = –91.8 kJ mol –1 What will…
- System in which there is no exchange of matter, work or energy from surrounding is
- Which of the following does not represent enthalpy change during phase transformation?
- What is the enthalpy change for the given reaction, if enthalpies of formation of Al 2 O 3 and Fe 2 O 3 are –1670 kJ…
- Consider the following reaction : CO _ (g) + 1 2 O _ 2(g) CO _ 2(g) How are Δ E and Δ H related for the reaction?
- The correct relationship between free energy change in a reaction and the corresponding equilibrium constant, K c is
- Which of the following is not a correct statement about enthalpy of solution?
- When I 2 dissociates to its atomic form the following reaction occurs. I 2( g ) 2I ( g ) ; D f H ° = + 150 kJ The…
- For a reaction : C ( s ) + O 2( g ) → CO 2( g ) What is the relation between enthalpy of reaction (Δ H R ), enthalpy of…
- When 50 mL of a strong acid is added to 50 mL of a strong base temperature rises by 4.5°C. What will be the increase in…
- Which of the following statements regarding Gibb’s energy change is correct?
- What will be the melting point of KCl if enthalpy change for the reaction is 7.25 J mol –1 and entropy change is 0.007…
- What will be the amount of heat evolved by burning 10 L of methane under standard conditions? (Given heats of formation…
- At 373 K steam and water are in equilibrium and D H = 40.98 kJ mol –1 . What will be D S for conversion of water into…
- For a reaction, 2 K ( g ) + L ( g ) → 2 M ( g ) ; Δ U ° = –10.5 kJ and Δ S ° = – 44.1 J K –1 . Calculate Δ G ° for the…
- The given enthalpy diagram represents which of the following reactions?
- For a reaction, CaCO 3 ( s ) → CaO ( s ) + CO 2( g ) D f H °(CaO) = – 635.1 kJ mol –1 , D f H °(CO 2 ) = –393.5 kJ mol…
- Dissociation of water takes place in two steps: H 2 O → H + OH; D H = +497.8 kJ OH → H + O; D H = 428.5 kJ What is the…
- What will be the heat of reaction for the following reaction? Will the reaction be exothermic or endothermic? Fe 2 O 3(…
- Which of the following processes is a non-spontaneous process?
- Δ G is the net energy available to do useful work and is a measure of free energy. If a reaction has positive enthalpy…
- Bond dissociation energies of H 2 , Cl 2 and HCl ( g) are 104, 58 and 103 kcal mol –1 respectively. Calculate the…
- Bond energies of H H and Cl Cl are 430 kJ mol –1 and 242 kJ mol –1 respectively. D H f for HCl is 91 kJ mol –1 . What…
- For combustion of 1 mole of benzene at 25°C, the heat of reaction at constant pressure is –780.9 kcal. What will be the…
- At what temperature liquid water will be in equilibrium with water vapour? D H vap = 40.73 kJ mol –1 , D S vap = 0.109…
- For a reaction, P + Q → R + S . The value of Δ H ° is –30 kJ mol –1 and Δ S is –100 J K –1 mol –1 . At what temperature…
- What will be D H for the reaction, CH 2 Cl 2 → C + 2H + 2Cl? ( B . E . of C H and C Cl bonds are 416 kJ mol –1 and 325…
- If the heat change at constant volume for decomposition of silver oxide is 80.25 kJ. What will be the heat change at…
- Reaction of methanol with dioxygen was carried out and Δ U was found to be – 726 kJ mol –1 at 298 K. The enthalpy…
- 50 mL of 1 M NaOH is mixed with 50 mL of 1 M HCl and rise in temperature T 1 is noted. In second experiment, 100 mL of…
- What will be the standard internal energy change for the reaction at 298 K? OF 2( g ) + H 2 O ( g ) → O 2( g ) + 2HF (…
- Two reactions are given below: C (graphite) + O 2( g ) → CO 2( g ) ; Δ H = – 393.7 kJ ; C (diamond) → C (graphite) ; Δ…