JEE Main & Advanced Chemistry Equilibrium Question Bank Activation energy, Standard free energy and Degree of dissociation and Vapour density

  • question_answer The vapor density of completely dissociated \[N{{H}_{4}}Cl\]  would be                                 [NCERT 1974]

    A)                 Slight less than half that of                                                                                         \[N{{H}_{4}}Cl\]

    B)                 Half  that of                                                                                         \[N{{H}_{4}}Cl\]

    C)                 Double that of                                                                                         \[N{{H}_{4}}Cl\]  

    D)                 Determined by the amount of solid                                                                                         \[N{{H}_{4}}Cl\]  in the experiment

    Correct Answer: B

    Solution :

           \[\frac{\text{Normal}\,\,\text{molecular}\,\,\text{weight}}{\text{experimental}\,\,\text{molecular}\,\,\text{wt}\text{.}}\]= 1 + a                  \[N{{H}_{4}}Cl\] ⇌ \[N{{H}_{3}}+HCl\]                                 \[\because \alpha =1\] \Experimental Molecular wt =\[\frac{\text{nor}\text{.mol}\text{.wt}\text{.}}{2}\]

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