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JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank Rate of decay and Half-life

  • question_answer
    An artificial radioactive isotope gave \[_{7}^{14}N\]after two successive \[\beta -\]particle emissions. The number of neutrons in the parent nucleus must be                                                [KCET 2004]

    A)                 9             

    B)                 14

    C)                 5             

    D)                 7

    Correct Answer: A

    Solution :

               \[_{x}{{X}^{y}}\xrightarrow{2\beta }{{\,}_{7}}{{N}^{14}}\]                    \[_{x=7-2}{{X}^{y=14}}={{\,}_{5}}{{X}^{14}}\]                                 Total no. of neutrons =14 ? 5 = 9


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