J & K CET Engineering J and K - CET Engineering Solved Paper-2012

  • question_answer
    Paramagnetism is shown by

    A) \[~{{N}_{2}}\]            

    B) \[{{O}_{2}}\]

    C) \[{{F}_{2}}\]            

    D) \[C{{O}_{2}}\]

    Correct Answer: B

    Solution :

     Paramagnet shown by\[{{O}_{2}}.\] \[\sigma 1{{s}^{2}},\overset{*}{\mathop{\sigma }}\,1{{s}^{2}},\sigma 2{{s}^{2}},\overset{*}{\mathop{\sigma }}\,2{{s}^{2}},\sigma 2p_{z}^{2},\pi 2p_{x}^{1+1}\] \[\approx \pi 2p_{y}^{1+1}\] \[\overset{*}{\mathop{\pi }}\,2p_{x}^{1}\approx \overset{*}{\mathop{\pi }}\,p_{y}^{1}\overset{*}{\mathop{\sigma }}\,2{{p}_{z}}\] \[\therefore \]It contains two unpaired electrons so, is paramagnetic.


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