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NEET Sample Paper NEET Sample Test Paper-26

  • question_answer
    Of the species \[H_{2}^{+},He_{2}^{+}\] and \[O_{2}^{+}\] all are:

    A)  diamagnetic               

    B)  paramagnetic

    C)  stable            

    D)  unstable

    Correct Answer: B

    Solution :

    \[H_{2}^{+}:\,{{(\sigma \,1s)}^{1}}\] Number of unpaired electron \[=1\] \[He_{2}^{+}:\,{{(\sigma 1s)}^{2}}\,{{(\sigma *1s)}^{1}}\] Number of unpaired electron \[=1\] \[O_{2}^{+}:KK{{(\sigma 2s)}^{2}}{{(\sigma *2s)}^{2}}{{(\sigma 2{{p}_{2}})}^{2}}{{(\pi 2{{p}_{x}})}^{2}}{{(\pi 2{{p}_{x}})}^{2}}{{(\pi *2{{p}_{x}})}^{1}}\]Number of unpaired electron \[=1\] Hence, \[H_{2}^{+},He_{2}^{+}\] and \[O_{2}^{+}\] all are paramagnetic because they have unpaired electron.


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