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Thermodynamics ...

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  • Question 1
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    A spontaneous process may be defined as :

  • Question 2
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    Ideal gas is contained in a thermally insulated and rigid container and it is heated through a resistance $$100\Omega $$ by passing a current of $$1A$$ for five minutes, then change in internal energy of the gas is

  • Question 3
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    Directions For Questions

    The electrochemical cell shown below is a concentration cell.
    $$M | M^{2+} \left (\text {Saturated solution of sparingly soluble salt}, MX_{2}\right ) | | M^{2+}(0.001\ mol\ dm^{-3})|M$$
    The emf of the cell depends on the difference in concentrations of $$M^{2+}$$ ions at the two electrodes. The emf of the cell at $$298\ K$$ is $$0.059\ V$$.

    ...view full instructions

    The value of $$\triangle G (kJ\ mol^{-1})$$ for the given cell is: (take $$1F = 96500\ C\ mol^{-1})$$

  • Question 4
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    A piece of ice kept at room temperature melts of its own. This reaction is governed by which law?

  • Question 5
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    Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction?

  • Question 6
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    Match the List-II ans List-II and List III:

    List-IList-IIList-III
    A. $$\Delta \, G>0$$X. $$\Delta \, S>0$$1. Non-spontaneous
    B. $$\Delta \, G<0$$Y. $$\Delta \, S<0$$2. Spontaneous
    C. $$\Delta \, G=0$$Z. $$\Delta \, S=0$$3. Equilibrium
    select the correct answering from the following codes:

  • Question 7
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    If $$\triangle H_{vaporisation}$$ of substance $$X(l)$$ (molar mass: $$30\ g/mol)$$ is $$300\ J/g$$ at it's boiling point $$300\ K$$, then molar entropy change for reversible condensation process is____________.

  • Question 8
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    Heat of combustion $$\Delta H^o$$ for $$C(s), H_2(g)$$ and $$CH_4(g)$$ are $$-94,-68$$ and $$-213 kcal/mol$$ respectively. Then $$\Delta H^o$$  for $$C(s) + 2H_2(g) \rightarrow CH_4$$ is:

  • Question 9
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     $$H_{2(g)} + \dfrac{1}{2} O_{2(g)} \rightarrow H_2O_{(g)}$$$$\Delta H = 241.8 kJ$$ $$CO_{(g)} + \dfrac{1}{2} O_{2(g)} \rightarrow CO_{2(g)}$$ $$\Delta H = 283 kJ$$ 
    The heat evolved during the combustion of $$112$$ litre of water gas (mixture of equal volume of $${H}_{2}$$ and $$CO$$) is:

  • Question 10
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    One mole of a real gas is subjected to a process from $$(2\ bar, 30\ lit, 300\ K)$$ to $$(2\ bar, 50\ lit, 400\ K)$$
    Given: $$C_{V} = 40\ J/mol\ K$$,
    $$C_{P} = 50\ J/mol/ K$$
    Calculate $$\Delta U$$.

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