| | | | | | 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 | | | | | | | | | |
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