| | | | MCQ Tutorial - Chemistry->Thermodynamics | | | | 1.) Standard enthalpy of vapourisation DvapHQ for water at 100°C is 40.66 kJmol–1. The internal energy of vapourisation of water at 100°C (in kJmol–1) is
(Assume water vapour to behave like an ideal gas) | | Options are: | | A.) +43.76
| | B.) +37.56
| | C.) –43.76
| | D.) +40.66
| | Correct Option: B | | | | | | | 2.) The enthalpy of fusion of water is 1.435 kcal/mol. The molar entropy change for the melting of ice at 0°C is | | Options are: | | A.) 21.04 cal/(mol K)
| | B.) 0.526 cal/(mol K)
| | C.) 10.52 cal/(mol K)
| | D.) 5.260 cal/(mol K)
| | Correct Option: D | | | | | | | 3.) Consider the reaction:
4NO2(g) + O2(g) → 2N2O5(g), ΔrH = –111KJ.
If N2O5(s) is formed instead of N2O5(g) in the above reaction, the value of ΔrH will be:
(given, ΔH of sublimation for N2O5 is 54 KJ mol–1) | | Options are: | | A.) +219 KJ
| | B.) +54 KJ
| | C.) -219 KJ
| | D.) -165 KJ
| | Correct Option: C | | | | | | | 4.) Based on the first law of thermodynamics, which one of the following is correct? | | Options are: | | A.) For an isothermal process, q=+w
| | B.) For an adiabatic process, ∆U=-w
| | C.) For an isochoric process, ∆U=-q
| | D.) For a cyclic process, q=-w
| | Correct Option: D | | | | | | | 5.) The amount of the heat released when 20 ml 0.5 M NaOH is mixed with 100 ml 0.1 M HCl is y kJ. The heat of neutralization is ------. | | Options are: | | A.) +100y KJ/mol
| | B.) –100y KJ/mol
| | C.) +50y KJ/mol
| | D.) –50y KJ/mol
| | Correct Option: B | | | | | | | | | | | |