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Chemistry Test 73
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Chemistry Test 73
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  • Question 1/6
    4 / -1

    The enthalpy of neutralization of acetic acid and sodium hydroxide is –55.4 KJ. What is the enthalpy of ionization of acetic acid ?

    Solutions

    Heat of ionization of weak acid

    = 57.3 – 55.4

    = 1.9 KJ

     

  • Question 2/6
    4 / -1

    The bond enthalpies of H2 , X2 and HX are in the ratio of 2 : 1 : 2. If the enthalpy for formation of HX is –50 KJ mol–1, the bond enthalpy of H2 is :-

  • Question 3/6
    4 / -1

    Calculate the work done when 1 mole Al4C3(s) react with water in closed vessel at 27°C against 3 atm atomspheric pressure ?

    Solutions

    In closed vessel ΔV = 0

    W = –PΔv = 0

     

  • Question 4/6
    4 / -1

    A + B —→ C

    For reaction ΔH = –xJ

                        ΔS = –yJ

    Reaction would be spontanrous at :-

    Solutions

    ΔG = ΔH – TΔS = – – (–) = – + 

    T­↑ΔG = –ve

     

  • Question 5/6
    4 / -1

    If 150 calories of heat are added to a system and a work of 200 joule is done on the system then calculate change in internal energy of the system:-

    Solutions

    Heat absorbed ; q = 150 cal

    = 150 × 4.2 = 630 Joule

    Work done on the system ; w = + 200 Joule

    From first law of thermodynamics

    ΔU = q + w

    = 630 + 200

    = 830 Joule

     

  • Question 6/6
    4 / -1

    An ion M+3 has electronic configuration [Ar]3s104s2. Element M belongs to :-

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