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Thermodynamics ...

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  • Question 1
    1 / -0

    $$\Delta U = q + w$$, is mathematical expression for

  • Question 2
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    A reaction proceeds through two paths I and II to convert $$X \rightarrow Z$$
    What is the correct relationship between $$Q,  Q_{1}$$ and $$Q_{2}$$?

  • Question 3
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    A gaseous system is initially characterised by 500 mL volume and 1 atm pressure at 298 K. This system is allowed to do work as
    (i) In isobaric conditions it expands to 800 mL resulting a decrease in pressure and temperature to 0.6 atm and 273 K respectively.
    (ii) In adiabatic conditions it is allowed to expand upto 800 mL and results a decrease in pressure and temperature to 0.6 atm and 273 K respectively.

    If Glibbs energy change in (i) $$\Delta G_{a}$$ and in is $$\Delta G_{b}$$ then what will be the ratio of  $$\dfrac{\Delta G_{a}}{\Delta G_{b}}?$$

  • Question 4
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    Read the following statements regarding the spontaneity of a process and mark the appropriate choice.
    (i) When enthalpy factor is absent then randomness factor decides spontaneity of a process.
    (ii) When randomness factor is absent then enthalpy factor decides spontaneity of a process.
    (iii) When both the factors take place simultaneously the magnitude of both factors decides spontaneity of a process.

  • Question 5
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    Which thermochemical process is shown by the following figure?

  • Question 6
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    At dynamic equilibrium, the reactions on both sides occur at the same rate and the mass on both sides of the equilibrium does not undergo any change. This condition can be achieved only when the value of $$\Delta G$$ is: 

  • Question 7
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    Which of the following processes is a non-spontaneous process?

  • Question 8
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    Which of the following statements is not correct?

  • Question 9
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    For the reaction given below the values of standard Gibbs free energy of formation at $$298 K$$ are given. What is the nature of the reaction?

       $$I_{2} + H_{2}S \rightarrow 2HI + S$$

    $$\Delta G^{o}_{f} (HI) = 1.8\ kJ mol^{-1}, \Delta G^{o}_{f} (H_{2}S) = 33.8\ kJ mol^{-1}$$

  • Question 10
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    Which of the following conditions will always lead to non-spontaneous change?

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