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CMC Medical CMC-Medical VELLORE Solved Paper-2008

  • question_answer
    Which of the following is the correct order of increasing enthalpy of vaporisation?

    A)  \[N{{H}_{3}}<P{{H}_{3}}<As{{H}_{3}}\]

    B)  \[As{{H}_{3}}<P{{H}_{3}}<N{{H}_{3}}\]

    C)  \[P{{H}_{3}}<As{{H}_{3}}<N{{H}_{3}}\]

    D)  \[N{{H}_{3}}<As{{H}_{3}}<P{{H}_{3}}\]

    E)  \[As{{H}_{3}}<N{{H}_{3}}<P{{H}_{3}}\]

    Correct Answer: C

    Solution :

                    Order of increasing enthalpy of vaporisation is \[P{{H}_{3}}<As{{H}_{3}}<N{{H}_{3}}\] The enthalpy of \[N{{H}_{3}}\] is higher due to the H-bonding.


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