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 Multiple Choice QuestionsMultiple Choice Questions

91.

The criterion for a spontaneous process is

  • ΔG >0 

  • ΔG < 0

  • ΔG = 0

  • ΔStotal < 0


92.

Choose the reaction in which H is not equal to U

  • C(graphite) + O2(g) → CO2(g)

  • C2H4(g) + H2(g) → C2H6(g)

  • 2C(graphite) + H2(g) → C2H2(g)

  • H2(g) + I2(g) → 2HI(g)


93.

The standard enthalpies of combustion of C6H6 (l), C(graphite) and H2 (g) are respectively -3270 kJ mol-1, -394 kJ mol-1 and -286 kJ mol-1. What is the standard enthalpy of formation of C6H6 (l) in kJ mol-1?

  • -48

  • +48

  • -480

  • +480


94.

What is the amount of work done when 0.5 mole of methane, CH4(g), is subjected to combustion at 300 K? (Given, R=8.314JK-1 mol-1)

  • -2494 J

  • -4988 J

  • + 4988 J

  • + 2494 J


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95.

In the reaction; A2(g) + 3B2(g) → 2AB3(g), the standard entropies in (JK-1 mol-1) of A2(g), B2(g) and AB3(g) are respectively 190, 130 and 195 and the standard enthalpy change for the reaction is -95 kJ mol-1. The temperature (in K) at which the reaction attains equilibrium is (assuming both the standard entropy change and standard enthalpy change for this reaction are constant over a wide range of temperature)

  • 500

  • 400

  • 300

  • 200


96.

Calculate the standard enthalpy change (in kJ mol-1) for the reaction

    H2(g) + O2(g) → H2O2(g)

Given that bond enthalpies of H-H, O=O, O-H and O-O (in KJ mol-1) are respectively 438, 498, 464 and 138.

 

  • -130

  • -65

  • +130

  • -334


97.

According to the first law of thermodynamics which of the following quantities represents the change in a state function?

  • qrev + Wrev

  • qrev

  • qrev - Wrev

  • qrev / Wrev


98.

If the activation energy for the forward reaction is 150 kJ mol-1 and that of the reverse reaction is 260 kJ mol-1, what is the enthalpy change for the reaction?

  • 410 kJ mol-1

  • 110kJ mol-1

  • -110 kJ mol-1

  • -410 kJ mol-1


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99.

When 0.2 g of 1-butanol was burnt in a suitable apparatus, the heat evolved was sufficient to raise the temperature of 200 g water by 5°C. The enthalpy of combustion of 1-butanol in kcal mol-1 will be

  • +37

  • +370

  • -370

  • -740


100.

Given that dE = Tds - pdV and H = E + pV. Which one of the following relations is true ?

  • dH = TdS + Vdp

  • dH = SdT + Vdp

  • dH = -SdT + Vdp

  • dH = dE + pdV


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