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AIIMS AIIMS Solved Paper-2011

  • question_answer
    The following are some statements related to VA group hydrides, I. Reducing property increases from \[N{{H}_{3}}\] to\[Bi{{H}_{3}}\] II. Tendency to donate lone pair decreases from \[N{{H}_{3}}\] to \[Bi{{H}_{3}}\] III. Thermal stability of hydrides decreases from \[N{{H}_{3}}\] to  \[Bi{{H}_{3}}\] IV. Bond angle of hydrides decreases from \[N{{H}_{3}}\] to \[Bi{{H}_{3}}\] The correct statements are

    A)  I, II, III and IV   

    B)  I, III and IV        

    C)         I, II and IV      

    D)         I and IV

    Correct Answer: A

    Solution :

    (I) The reducing property of the hydrides of V A group increases from \[N{{H}_{3}}\] to \[Bi{{H}_{3}}\] as \[M-H\] bond length increases. (Where, \[MN,P\text{ }As,\text{ }Sb,\text{ }Bi\]) \[N{{H}_{3}}<P{{H}_{3}}<As{{H}_{3}}<Sb{{H}_{3}}<Bi{{H}_{3}}\] (II) The tendency to donate lone pair or basic strength decreases from \[N{{H}_{3}}\] to \[Bi{{H}_{3}}\]. \[N{{H}_{3}}>P{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}>Bi{{H}_{3}}\] (III) Thermal stability of VA group hydrides decreases from  \[N{{H}_{3}}\]to\[Bi{{H}_{3}}\] . \[N{{H}_{3}}>P{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}>Bi{{H}_{3}}\] (IV) Bond angle of VA group hydride; decreases from \[N{{H}_{3}}\] to \[Bi{{H}_{3}}\]. \[N{{H}_{3}}>P{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}>Bi{{H}_{3}}\]


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