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JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank Causes of radioactivity and Group displacement law

  • question_answer
    An atom has mass number 232 and atomic number 90. How many \[\alpha \]-particles should it emit after emission of two \[\beta \]-particles, so that the new element's atom has mass number 212 and atomic number 82

    A)                 4             

    B)                 5

    C)                 6             

    D)                 3

    Correct Answer: B

    Solution :

           \[_{90}{{X}^{232}}\xrightarrow{-2\beta }{{\,}_{92}}{{Y}^{232}}\to {{\,}_{82}}{{Z}^{212}}+x{{\,}_{2}}H{{e}^{4}}\]                                 No. of \[\alpha \]-particles \[=\frac{232-212}{4}=\frac{20}{4}=5\].


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