16 g of oxygen gas expands isothermally and reversibly at 300 K f

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 Multiple Choice QuestionsMultiple Choice Questions

71.

For the reaction,

2H2(g) + O2(g)  2H2O(g), H°= - 573.2 kJ

The heat of decomposition of water per mole is

  • 286.6 kJ

  • 573.2 kJ

  • -28.66 kJ

  • Zero


72.

Hess's law is based on

  • law of conservation of mass

  • law of conservation of energy

  • first law of thermodynamics

  • None of the above


73.

Which of the following is a path function?

  • Internal energy

  • Enthalpy

  • Work

  • Entropy


74.

If for the cell reaction,

Zn + Cu2+  Cu + Zn2+;

entropy change S° is 96.5 J mol-1K-1, then temperature coefficient of the emf of a cell is

  • 5 × 10-4 VK-1

  • 1 × 10-3 VK-1

  • 2 × 10-3 VK-1

  • 9.65 × 10-4 VK-1


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75.

Cell reaction is spontaneous, when

  • Ered° is negative

  • Ered° is positive

  • G° is negative

  • G° is positive


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76.

16 g of oxygen gas expands isothermally and reversibly at 300 K from 10 dm3 to 100 dm3. The work done is (in J)

  • zero

  • - 2875 J

  • + 2875 J

  • infinite


B.

- 2875 J

The work done can be calculated as-

W = -2.303 nRT log V2V1

    = -2.303 × 1632 × 8.314 × 300 log 10010

    = -2872 J


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77.

If C(s) + O2(g)  CO(g); H = r  and CO(g) + 12O2(g)  CO2(g); H =s  then, the heat of formation of CO is

  • r+s

  • r-s

  • s-r

  • rs


78.

Heat of combustion of methane is -800 kJ. What is the heat of combustion for 4 × 10-4 kg of methane?

  • -800 kJ

  • -3.2 × 104 kJ

  • -20 kJ

  • -1600 kJ


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79.

Kirchhoff's equation is

  • log k2k1 = Ea2.303 R 1T1 - 1T2

  • log p2p1 = Hv2.303 R T2 - T1T1 × T2

  • Cp = H2 - H1T2 - T1

  • log k2k1 = H2.303 R 1T1 - 1T2


80.

The heat of combustion of carbon is - 393.5 kJ/mol. The heat released upon the formation of 35.2 g of CO2 from carbon and oxygen gas is

  • + 315 kJ

  • - 31.5 kJ

  • - 315 kJ

  • + 31.5 kJ


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