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Thermodynamics ...

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  • Question 1
    4 / -1

    The latent heat of vaporisation of a liquid at 500 K and 1 atm pressure is 10 kcal/mol. What will be the change in internal energy (∆E) of 3 moles of liquid at the same temperature?

  • Question 2
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    The work done in ergs for a reversible expansion of one mole of an ideal gas from a volume of 10 litres at 25°C is :

  • Question 3
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    Reaction, H2(g) + I2 (g) → 2HI; ∆H = 12.40 kcal. According to this, heat of formation of HI will be

  • Question 4
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    The heat of combustion of yellow phosphorus and red phosphorus are – 9.91 kJ and – 8.78 kJ respectively. The heat of transition of yellow phosphorus to red phosphorus is :

  • Question 5
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    The heat of formation of CO(g) and CO2 (g) are – 26.4 kcal and – 94.0 kcal respectively. The heat of combustion of carbon monoxide will be :

  • Question 6
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    The heats of combustion of rhombic and monoclinic sulphur are – 70960 and – 71030 calorie respectively. What will be the heat of conversion of rhombic sulphur to monoclinic sulphur?

  • Question 7
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    An ideal gas expands in volume from 1 × 10–3 m3 to 1 × 10–2 m3 at 300 K against a constant pressure of 1 × 105 Nm–2 . The work is :

  • Question 8
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    The enthalpies of combustion of carbon and carbon monoxide are – 393.5 and – 283 kJ mol– 1 respectively. The enthalpy of formation of carbon monoxide per mole is

  • Question 9
    4 / -1

    If the bond dissociation energies of XY, X2 and Y2 (all diatomic molecules) are in the ratio of 1 : 1 : 0.5 and DHf for the formation of XY is – 200 KJ mol–1. The bond dissociation energy of X2 will be

  • Question 10
    4 / -1

    Consider the reaction, N2(g) + 3H2(g) 2NH3(g); carried out at constant temperature and pressure. If ∆H and ∆U are enthalpy change and internal energy change respectively, which of the following expressions is true ?

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