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NEET Sample Paper NEET Sample Test Paper-11

  • question_answer
    A nuclide of an alkaline earth metal undergoes radioactive decay by emission of the\[\alpha -\]particles in succession. The group of the periodic table to which the resulting daughter element would belong is

    A)  group 4                        

    B)  group 6

    C)  group 16                      

    D)  group 14

    Correct Answer: D

    Solution :

     When IIA group element (Ra) loses one \[\alpha -\]particle its group no. decreases by two unit, i.e., go into zero group (group 16). But as it is radioactive due to successes emission, the last product obtained is Pb (group 14). \[{{\,}_{88}}R{{a}^{226}}\xrightarrow{{}}\,_{82}^{214}Pb+\,3_{2}^{4}He\]


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