NEET AIPMT SOLVED PAPER SCREENING 2009

  • question_answer
    According to MO theory which of the following lists ranks the nitrogen species in tends of increasing bond order ?

    A) \[\underset{\begin{smallmatrix}  \text{ }\!\!|\!\!\text{ } \\  \text{H} \end{smallmatrix}}{\overset{\begin{smallmatrix}  \text{H} \\  \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{C}}}}\,=\underset{\begin{smallmatrix}  \text{ }\!\!|\!\!\text{ } \\  \text{H} \end{smallmatrix}}{\overset{\begin{smallmatrix}  \text{H} \\  \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{C}}}}\,+\text{H}-\xrightarrow[{}]{{}}\text{H}-\underset{\begin{smallmatrix}  \text{ }\!\!|\!\!\text{ } \\  \text{H} \end{smallmatrix}}{\overset{\begin{smallmatrix}  \text{H} \\  \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{C}}}}\,-\underset{\begin{smallmatrix}  \text{ }\!\!|\!\!\text{ } \\  \text{H} \end{smallmatrix}}{\overset{\begin{smallmatrix}  \text{H} \\  \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{C}}}}\,-\text{H}\]     

    B) \[\text{mo}{{\text{l}}^{\text{-1}}}\]

    C)        \[\text{mo}{{\text{l}}^{\text{-1}}}\]

    D)        \[\text{mo}{{\text{l}}^{\text{-1}}}\]

    Correct Answer: B

    Solution :

    Key Idea Bond order \[{{B}_{2}}{{O}_{3}}\]where, \[CaO\] number of electrons in bonding MO \[Si{{O}_{2}}\] number of electrons in anti bonding MO \[BeO\] \[{{[Co{{(en)}_{2}}C{{l}_{2}}]}^{+}}\] \[{{[Co{{(N{{H}_{3}})}_{3}}C{{l}_{3}}]}^{0}}\] \[{{[Co(en)C{{l}_{2}}{{(N{{H}_{3}})}_{2}}]}^{+}}\] \[{{[Co{{(en)}_{3}}]}^{3+}}\] \[A{{l}_{2}}{{O}_{3}}\] \[4.5\times {{10}^{4}}\] \[A{{l}_{2}}{{O}_{3}}\] \[\text{A}l=27\text{g}\,\text{mo}{{\text{l}}^{-1}}\] \[9.0\times {{10}^{3}}g\]\[8.1\times {{10}^{4}}g\] Hence, the increasing order of B.O is, \[2.4\times {{10}^{5}}g\]


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