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NEET Sample Paper NEET Sample Test Paper-13

  • question_answer
    Number of neutrons in a parent nucleus X which gives\[_{7}{{N}^{14}}\]after two successive\[\beta -\]emissions would be

    A)  6                                

    B)  7

    C)  8                                

    D)  9

    Correct Answer: D

    Solution :

     \[{{\,}_{z}}{{X}^{m}}\xrightarrow{{}}{{\,}_{z+2}}{{N}^{14}}+2{{\,}_{-1}}{{e}^{0}}\] \[\therefore \]\[Z+2=7\]and \[m=14\] or \[Z=5\]and \[m=14\]\[\therefore \]\[n=m-Z=9\]


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