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MCQ Tutorial - Chemistry->Thermodynamics

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1.) Standard enthalpy of vapourisation DvapHQ for water at 100°C is 40.66 kJmol1. The
internal energy of vapourisation of water at 100°C (in kJmol1) is

(Assume water vapour to behave like an ideal gas)
Options are:
A.) +43.76
B.) +37.56
C.) 43.76
D.) +40.66
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)
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 mol1)
Options are:
A.) +219 KJ
B.) +54 KJ
C.) -219 KJ
D.) -165 KJ
                        
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
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
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