Chemical Thermodynamics — practice questions
97 curated practice questions from Chemical Thermodynamics (Chemistry NEET, NTA Exams) — 22 hard, 26 medium, 49 easy. Every question includes the final answer free; step-by-step worked solutions with a free account.
- Which of the following equations corresponds to the enthalpy of combustion at 298 K?
- Changes in a system from an initial state to the final state were made in a different manner such that 'ΔH' remains the…
- The enthalpies of combustion of carbon and carbon monoxide are - 393.5 and - 283 kJ mol -1 respectively. The enthalpy…
- Among the following, the set of parameters that represents path functions, is: q + w q w H - TS
- For the reaction, 2Cl(g) → Cl 2 (g), the correct option is:
- When a solute remains in equilibrium with a given solvent then:
- The standard Gibbs free energy change ΔG o is related to equilibrium constant K p as:
- At equilibrium condition, the value of Gibbs' free energy change, ∆G is:
- 1 g of water at atmospheric pressure has volume of 1 cc and when boiled it becomes 1681 cc of steam. The heat of…
- In conversion of limestone to lime, CaCO 3 (s) → CaO(s) + CO 2 (g) the values of ΔH o and ΔS o are + 179.1 kJ mol -1…
- A 3 mol sample of a triatomic ideal gas at 300 K is allowed to expand under isobaric adiabatic condition from 5 L to 40…
- For melting of 3 moles of water at 0 ° C, the ∆G is:
- On the basis of the following thermochemical data: [ H_ f ^ e (H^ + a q )=0 ] H _ 2 O ( l ) H ^ + ( aq )+ OH ^ - ( aq )…
- Which of the following reactions corresponds to the definition of enthalpy of formation at 298 K?
- Which of these species has a standard enthalpy of formation equal to zero?
- The bond dissociation energies of X 2 , Y 2 and XY are in the ratio of 1 : 0.5 : 1. H for the formation of XY is -200…
- For a spontaneous reaction the change in Gibbs' free energy, (∆G) is:
- The Δ f H o 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…
- A gas is compressed at a constant pressure from a volume of 10 m 3 to a volume of 4 m 3 , then work done on the system…
- If γ is the ratio of specific heats and R is the universal gas constant, then the molar specific heat at constant…
- For the equilibrium, ZH _ 2 O H _ 3 O ^ + + OH ^ - , the value of G° at 298 K is approximately:
- The standard enthalpy of formation of H 2 (g), Cl 2 (g) and HCl (g) are 218 kJ mol -1 , 121.68 kJ mol -1 and - 92.31 kJ…
- Given: C(graphite) + O 2 (g) → CO 2 (g); rH° = x kJ mol -1 C(graphite) + 1 2 _ 2 (g) (g) ; rH ° = y kJ mol -1 co (g)+ 1…
- For the chemical reaction x y , the standard reaction Gibbs energy depends on temperature T (in K) as: _ r G ^ - ( ink…
- A gas expands adiabatically from 1.0 L to 12.0 L against a constant pressure of 0.75 atm. The ΔU of the gas is:
- Standard molar enthalpy of formation of CO 2 is equal to:
- For a sample of perfect gas when its pressure is changed isothermally from p i to p f , the entropy change is given by
- For the reaction: X _ 2 O _ 4 (I) 2 XO _ 2 ( ~g ) U =2.1 k cal , 5=20 cal ~K ^ -1 at 300 ~K Hence, ΔG is:
- Calculate the enthalpy of vaporization for water from the following: H 2 (g) + 1 2 O_ 2 (g) → H 2 O (g), ∆H = - 57.0…
- The internal energy change when a system goes from state 'A' to 'B' is 40 kJ/mol. If the system goes from 'A' to 'B' by…
- Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
- Heat required to raise the temperature of 1 mole of a substance by 1°C is called:
- The Gibbs' free energy change of a reaction at 27°C is - 26 kcal, and its entropy change is - 60 cal K -1 . The value…
- A process has H = 200 J mol -1 and S = 40 JK -1 mol -1 . Out of the values given below, choose the minimum temperature…
- Pressure P, volume V and temperature T for a certain gas are related by P = xT - T ^ 2 ~V where II and β are constants…
- For the hypothetical reversible reaction: 1 2 A 2 (g) + 3 2 B 2 (g) → AB 3 (g), the value of ΔH is -20 kJ mol -1 while…
- The heat capacity per mole of water is: (R is universal gas constant)
- Given: Ag 2 O(s) → 2Ag(s) + 1 2 O 2 (g); ΔH = 30.66 kJ mol -1 . Which one of the following is correct?
- For the reaction, C 7 H 8 ( l ) + 9O 2 (g) → 7CO 2 (g) + 4H 2 O( l ), the calculated heat of reaction is 232.6 kJ mol…
- A well stoppered thermos flask contains some ice cubes. This is an example of:
- For an ideal gas, C p and C v are related as:
- Which of the following statements is correct for any thermodynamic system?
- If for a certain reaction r H is 30 kJ mol -1 at 450 K, the value of r S (in JK -1 mol -1 ) for which the same reaction…
- The correct relationship between free energy change in a reaction and the corresponding equilibrium constant K c is:
- For the process H 2 O ( l , 1bar, 373K) → H 2 O (g, 1bar, 373K), the correct set of thermodynamic parameters is:
- As O 2 (l) is cooled at 1 atm pressure, it freezes to form solid A at 54.5 K. At a lower temperature, solid A…
- The enthalpy change for a reaction does not depend upon the:
- How many grams of ice at 0°C can be melted by the addition of 500 J of heat? (The molar heat of fusion for ice is 6.02…
- For which of the following reactions, ΔH will be equal to ΔU?
- One mole of an ideal monatomic gas undergoes a process described by the equation FV ^ 3 = constant . The heat capacity…
- For a system in equilibrium, ΔG=0, under conditions of constant:
- Two blocks of the same metal having same mass and at temperature T 1 and T 2 , respectively are brought in contact with…
- Which amongst the following options is the correct relation between change in enthalpy and change in internal Energy?
- For an adiabatic process which of the following relation is correct:
- The enthalpy changes for the following processes are listed below: Cl 2 (g) = 2Cl(g), 242.3 kJ mol -1 I 2 (g) = 2I(g)…
- Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
- A piece of hot copper at is plunged into a pond at . The copper cools down to , while the pond, being huge, stays at…
- Hydrolysis of sucrose is given by the following reaction. Sucrose + H _ 2 O Glucose + Fructose If the equilibrium…
- Which of the following parameter does not characterize the thermodynamic state of matter?
- The standard enthalpy of formation [ H_ f ^ a ] at 298 K for methane, CH 4 (g), is -74.8 kJ mol -1 . The additional…
- The lattice enthalpy and hydration enthalpy of four compounds are given below: Compounds Lattice enthalpy (kJ/mol)…
- A diatomic cylinder filled with 1 mole of a monatomic gas with marble piston is submerged in boiling water at 1 atm…
- Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
- Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
- If for an ideal gas, the ratio of pressure and volume is constant and is equal to 1 atm L -1 , the molar heat capacity…
- Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below: 1 2 Cl _ 2 ( ~g )…
- A balloon filled with helium (32°C and 1.7 atm). bursts. Immediately afterwards the expansion of helium can be…
- Given below are two statements Statement I : Air quickly leaking out of a balloon becomes cooler. Statement II : The…
- 1 g of water, of volume 1 cm 3 at 100°C, is converted into steam at same temperature under normal atmospheric pressure…
- The approximate heat necessary to raise the temperature of 18.4 g of ethyl alcohol from 45 o C to 55 o C at 1 atm…
- Assuming that water vapour is an ideal gas, the internal energy change, ( Δ U) when 1 mole of water is vaporised at 1…
- 4.0 g of a gas occupies 22.4 litres at STP. The specific heat capacity of the gas at constant volume is 5.0 JK −1 . If…
- The reaction of cyanamide, NH 2 CN(s) with oxygen was run in a bomb calorimeter and ΔU at 300 K was found to be - 743…
- The specific heats at constant pressure is greater than that of the same gas at constant volume because:
- Standard entropy of X 2 , Y 2 and XY 3 are 60, 40 and 50 JK -1 mol -1 , respectively. For the reaction 1 2 X_ 2 + 3 2…
- 5 moles of an ideal gas at 100 K are allowed to undergo reversible compression till its temperature becomes 200 K. If C…
- In a given process on an ideal gas, d W=0 and d Q<0 . Then for the gas
- For which one of the following reactions, the value of ΔG increases with increase in temperature:
- In a reaction ∆H < 0 and ∆S < 0, the reaction proceeds further in the forward direction at:
- 1 mole of a gas is heated at temperature T _ n to ZT _ n according to the process P ^ T = a ~V ^ 2 , where II is…
- Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
- The enthalpy change for the reaction F 2 (g) + 2HCl(g) → 2HF(g) + Cl 2 (g) at 298 K is -357.6 kJ mol -1 . If the…
- Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
- Two rigid boxes containing different ideal gases are placed on a table. Box A contains one mole of nitrogen at…
- For a particular reversible reaction at temperature 'T', ∆H and ∆S were found to be both +ve. If, 'T' e is the…
- Given below are two statements: Statement I : Internal energy, U, of the system is a state function. Statement II : -w…
- The heats of atomisation of PH 3 (g) and P 2 H 4 (g) are 954 kJ mol -1 and 1485 kJ mol -1 respectively. The P-P bond…
- Given below are two statements: Statement I : A spontaneous process is reversible. Statement II : Gibbs' free energy…
- One mole of an ideal gas is expanded freely and isothermally at 300 K from 10 litres to 100 litres. If ΔU is zero then…
- Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
- Which of the following reaction corresponds to the definition of enthalpy of combustion at 25 ° C?
- H _ 2 O ( O ) H _ 2 O ( ~s ) For the freezing of liquid water at 1 atm pressure and at three different temperatures (a)…
- 4.48 L of an ideal gas at STP requires 12 calories to raise its temperature by 15 o C at constant volume. The C p of…
- Assertion: Specific heat of a gas at constant pressure is greater than its specific heat at constant volume. Reason: At…
- For a spontaneous reaction, ΔG, equlibrium constant (K) and E_ t e ^ n will be respectively:
- Values of ΔH and ΔS for different reactions are given below: Reaction ΔH(kJ mol -1 ) ΔS(J K -1 mol -1 ) I + 98.0 + 14.8…
- The word "standard" in standard molar enthalpy change implies: