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 Multiple Choice QuestionsMultiple Choice Questions

101.

Using the following thermochemical equations

(i) S(rh) + 3/2O2(g) → SO3 (g)       ΔH = -2x kJ mol-1

(ii) SO2(g) + 1/2O2 (g)  → SO3 (g)  ΔH = -y kJ mol-1

Find out the heat of formation of SO2 (g) in kJ mol-1.

  • (2x + y)

  • (x + y)

  • (2x/y)

  • (y- 2x)


102.

The activation energy of exothermic reaction A → B is 80 kJ mo1-1. The heat of reaction is 200 kJ mol-1. The activation evergy for the reaction B → A (in kJ mol-1) will be

  • 280

  • 200

  • 120

  • 40


103.

What would be the heat released when an aqueous solution containing 0.5 mole of HNO3 is mixed with 0.3 mole of OH- (enthalpy of neutralization is -57.1 k.J) ?

  • 28.5 kJ

  • 17.1 kJ

  • 45.7 kJ

  • 1.7 kJ


104.

Δ H and ΔS for a reaction are +30.558 kJ mol-1 and 0.066 kJ K-1mol-1 at 1 atm pressure. The temperature at which free energy change is equal to zero and the nature of the reaction below this temperature are :

  • 483 K, spontaneous

  • 443 K, non-spontaneous

  • 443 K, spontaneous

  • 463 K, non-spontaneous


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105.

The enthalpy of vaporization of substance is 840 J mol-1 and its boiling point is -173°C. Its entropy of vaporization is :

  • 42 J mol-1 K-1

  • 21 J mol-1 K-1

  • 84 J mol-1 K-1

  • 8.4 J mol-1 K-1


106.

Given the following thermochemical equations:

Zn + 12O2 → ZnO + 84,000 cal

Hg + 12O2 → HgO + 21,700 cal

Accordingly the heat of reaction for the following reaction, Zn + HgO → Hg + heat is:

  • 105,700 cal

  • 61,000 cal

  • 62,300 cal

  • 60,000 cal


107.

The law of thermodynamics formulated by Dr.N. Nernst is :

  • first law of thermodynamics

  • second law of thermodynamics

  • third law of thermodynamics

  • both (a) and (b)


108.

Heat of neutralization will be minimum for which of the following combination?

  • NaOH + H2SO4

  • NH4OH + CH3COOH

  • NaOH + HCl

  • NaOH + CH3COOH


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109.

2 moles of helium gas expanded isothermally and irreversible at 27°C from volume 1 dm3 to 1 m3 at constant pressure of 100 kPa. Calculate the work done.

  • 99900 kJ

  • 99900 J

  • 34464.65 kJ

  • 34464.65 J


110.

Heat of formation of SO2 is -298 kJ. What is the heat of combustion of 4 g of S ?

  • + 37 kJ

  • -37.15 kJ

  • + 298 kJ

  • 18.6 kJ


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