Chemistry Question Bank

The following two reactions are known Fe₂O₃(s) + 3CO(g) → 2Fe(s) + 3CO₂(g); ∆H = –26.8 kJ FeO(s) + CO(g) → Fe(s) + CO₂(g); ∆H = – 16.5 kJ The value of ∆H for the following reaction Fe₂O₃(s) + CO(g) → 2FeO(s) + CO₂(g) …

Identify the correct statement for change of Gibbs’ energy for a system system ( G ) at constant temperature and pressure. (2006)

The enthalpy and entropy change for the reaction: 2(l) 2(g) (g) Br Cl 2BrCl → are 30 kJ mol–1 and 105JK–1 mol–1 respectively. The temperature at which the reaction will be in equilibrium is (2006)

Bond dissociation enthalpy of H₂ Cl₂, and HCl are 434, 242 and 431 kJ mol respectively. Enthalpy of formation of HCl is (2008)

For the gas phase reaction, 5(g) 3(g) 2(g) PCl PCl Cl Which of the following conditions are correct? (2008)

From the following bond energies: H — H bond energy : 431.37 kJ mol–1 C == C bond energy : 606.10 kJ mol–1 C — C bond energy : 336.49 kJ mol–1 C — H bond energy : 410.50 kJ mol–1 Enthalpy for the reaction, will be (2009)

Which of the following are not state functins? (I) q + w (II) Q (III) w (IV) H – TS (2009)

For vaporization of water at 1 atmospheric pressure, the values of ∆H and ∆S are 40.63 kJ mol–1 and 108.8 J K–1 mol–1, respectively. The temperature when Gibbs’ energy change (∆G) for this transformation will be zero,…

Standard entropies of X2, Y₂ and XY₃ are 60, 40 and 50 J K–1 mol–1 respectively. For the reaction 1/2X2 + 3/2Y₂ ⇌ XY₃, ∆H = –30 kJ, to be at equilibrium, the temperature should be (2010)

Enthalpy change for the reaction, 4H(g) 2H (g) → is – 869.6 kJ. The dissociation energy of H–H bond is (CBSE AIPMT 2011)

If the enthalpy change for the transition of liquid water to steam is 30 kJ mol–1 at 27°C, the entropy change for the process would be (2011)

The enthalpy of fusion of water is 1.435 kcal/mol. The molar entropy change for the melting of ice at 0°C is (2012)

Closed system can exchange (with surroundings)

Which of the following is true about isolated system?

Which of the following is not a state function?

Which of the following is a state variable?

An ideal gas is taken around the cycle ABCA as shown in P-V diagram The net work done by the gas during the cycle is equal to:

Which of the following is not an intensive property?

Which of the following is a state function and also an extensive property?

Tea placed in thermos flask is an example of

A thermally isolated gaseous system can exchange energy with the surroundings. The mode of energy may be

Regarding the internal energy of the molecule, which of the following statement is correct?

Internal energy is the sum of

Which of the following processes is irreversible?

A reaction having equal energies of activation for forward and reverse reactions has (NEET 2013)