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Thermodynamics ...

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  • Question 1
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    The enthalpies of elements in their standard states are taken as zero. The enthalpy of formation of a compound

     

  • Question 2
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    Given,



  • Question 3
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    Diborane is a potential rocket fuel which undergoes combustion according to the reaction,

    From the following data, enthalpy change for the combustion of diborane is 



  • Question 4
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    Following diagram represents Born-Haber cycle to determine lattice energy of NaCI(s). It is based on Hess’s law of constant heat summation. ΔlatticeH° of 


  • Question 5
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    Thus,

  • Question 6
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    Given, HCI (g) → H (g) + Cl (g) at 298 K (say temperature T K),

    For

    Q. Thus, for the given reaction  (at 0 K) is

  • Question 7
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    The measured enthalpy change for burning of ketene (g) (CH2CO) is - 981.1 kJ mo-1 at 298 K ,CH2CO (g)+ 2O2(g) → 2CO2 (g) + H2O (g) and that of CH4 (g) is - 802.3 kJ mol-1 at 298 K

    Thus, enthalpy change at 298 K for the following thermochemical reaction is

  • Question 8
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    Direction (Q. Nos. 8) This sectionis based on statement I and Statement II. Select the correct answer from the code given below.

    Q. In the following thermochemical reactions,



    Statement I : Enthalpy of combustion of CO(g) is - 26 kcal mol-1.

    Statement II : CO2(g) is an exothermic compound.

  • Question 9
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    Direction (Q. Nos. 9 and 10) This section contains a paragraph, wach describing  theory, experiments, data etc. three Questions related to paragraph have been  given.Each question have only one correct answer among the four given  ptions  (a),(b),(c),(d).

    Consider the following thermochemical equations



     

    Q. ΔrH° of the following thermochemical reaction is

    CIO2 (g) + O (g) →  CIO3 (g)

  • Question 10
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    Consider the following thermochemical equations



     

    Q. ΔrH° of the following thermochemical reaction is

  • Question 11
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    Direction (Q. Nos. 11) Choice the correct combination of elements and column I and coloumn II  are given as option (a), (b), (c) and (d), out of which ONE option is correct.

    Q. For liquid water at




    Compare the parameters ΔH1, ΔH2 ... in Column I with the corresponding values in kJ in Column II.

  • Question 12
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    The internal energy of a perfect gas is :

     

  • Question 13
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    Energy hidden in a definite quantity of substance is:

     

  • Question 14
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    Which of the following relations is not correct?

     

  • Question 15
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    Hess's law of constant heat summation is based on

     

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