Chemistry Question Bank

For the reaction, 8 g 2 g 2 g l C H 5O 3CO 4H O → at constant temperature, H E is (2003)

Assertion: A process is called adiabatic if the system does not exchange heat with the surroundings. Reason: It does not involve increase or decrease in temperature of the system

Which of the following is intensive property?

Which of the following p-V curve represents maximum work done? (NEET 2022) (a) (b) (c) (d) Ans. (b) Sol. Option (b), represents maximum work done

Which of the following are extensive properties?

If the bond energies of H–H, Br–Br, and H–Br are 433, 192 and 364 kJ mol–1 respectively, the H for the reaction 2(g) 2(g) (g) H Br 2HBr → is (2004)

The standard enthalpies of formation of HCl(g), H  (g) and  Cl₂(g)  are  –92.2,  217.7  and  121.4  kJ  mol-1 respectively. The bond dissociation energy of HCl is:

For irreversible expansion of an ideal gas under isothermal condition, the correct option is (NEET 2021)

Match List I with List II and select the correct answer using the codes given below the lists: List – I List – II A. T G P

The correct thermodynamic conditions for the spontaneous reaction at all temperatures is (NEET-I 2016)

The heat of formation of Fe O s is –824.2 kJ mol–1. ∆H for the reaction. 2Fe O s 4Fe s 3O g → is:

Reversible expansion of an ideal gas under isothermal and adiabatic conditions are as shown in the figure. AB → Isothermal expansion AC → Adiabatic expansion Which of the following options is not correct? (Odisha NEET…

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

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

The values of H and S for the reaction, (graphite) 2(g) (g) C CO 2CO → Are 170 kJ and 170 JK–1, respectively. This reaction will be spontaneous at (2009)

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)

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,…

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)

Equal volumes of two monatomic gases, A and B at same temperature and pressure are mixed. The ratio of specific heats (CP/CV) of the mixture will be (2012)

105. (∆U – ∆H) for the formation of NH₃ from N₂ and H₂ is :

Three thermochemical equations are given below: (i) C(graphite) + O₂(g) → CO₂(g); ∆rH° = x kJ mol–1 (ii) C(graphite) + ½O₂(g) → CO(g); ∆rH° = y kJ mol–1 (iii) CO(g) + ½O₂(g) → CO₂(g); ∆rH° = z kJ mol–1 Based on the ab…

For the reaction, X2O₄(l) → 2XO₂(g) ∆U = 2.1 kcal, ∆S = 20 cal K–1 at 300 K Hence, ∆G is (2014)

The heat of combustion of carbon to CO₂ is –393.5 kJ/mol. The heat released upon formation of 35.2 g of CO₂ from carbon and oxygen gas is (2015)

A gas is allowed to expand in a well-insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy U of the gas in joul…

Which of the following statements is correct for the spontaneous adsorption of a gas? (2014)