NEET Sample Paper NEET Sample Test Paper-14

  • question_answer ) Choose the correct sequence of bond order from the following.

    A) \[{{O}_{2}}^{2-}>{{O}_{2}}^{+}>{{O}_{2}}^{-}>{{O}_{2}}\]

    B) \[{{O}_{2}}^{+}>{{O}_{2}}^{2+}>{{O}_{2}}^{-}>{{O}_{2}}\]

    C) \[{{O}_{2}}^{+}>{{O}_{2}}>{{O}_{2}}^{-}>{{O}_{2}}^{2-}\]

    D) \[{{O}_{2}}>{{O}_{2}}^{-}>{{O}_{2}}^{2-}>{{O}_{2}}^{+}\]   

    Correct Answer: C

    Solution :

    Species Total\[{{e}^{-}}\] Configurations Bond order
    \[{{O}_{2}}\] 16 KK \[\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2s)}^{2}}\]\[\sigma {{(2{{p}_{z}})}^{2}}\]\[\pi {{(2{{p}_{x}})}^{2}}\pi {{(2{{p}_{y}})}^{2}}\]\[{{\pi }^{*}}{{(2{{p}_{x}})}^{1}}\]\[{{\pi }^{*}}{{(2py)}^{1}}\] \[\frac{(8-4)}{2}=2.0\]
    \[{{O}^{2+}}\] 15 KK \[\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2s)}^{2}}\sigma {{(2{{p}_{z}})}^{2}}\]\[\pi {{(2{{p}_{x}})}^{2}}\pi {{(2{{p}_{y}})}^{2}}\]\[{{\pi }^{*}}{{(2{{p}_{x}})}^{1}}\] \[\frac{(8-3)}{2}=2.5\]
    \[{{O}_{2}}^{-}\] 17 KK \[\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2s)}^{2}}\sigma {{(2{{p}_{z}})}^{2}}\]\[\pi {{(2{{p}_{x}})}^{2}}\pi {{(2{{p}_{y}})}^{2}}{{\pi }^{*}}{{(2{{p}_{x}})}^{2}}\] \[{{\pi }^{*}}{{(2{{p}_{y}})}^{1}}\] \[\frac{(8-5)}{2}=1.5\]
    \[{{O}_{2}}^{2-}\] 18 KK \[\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2s)}^{2}}\sigma {{(2{{p}_{z}})}^{2}}\] \[\pi {{(2{{p}_{x}})}^{2}}\pi {{(2{{p}_{y}})}^{2}}{{\pi }^{*}}{{(2{{p}_{x}})}^{2}}\] \[{{\pi }^{*}}{{(2{{p}_{y}})}^{2}}\] \[\frac{(8-6)}{2}=1.0\]
    Hence, the correct option is [c].

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