NEET Sample Paper NEET Sample Test Paper-9

  • question_answer A radioactive nucleous decays according to following series\[X\xrightarrow{\alpha }{{X}_{1}}\xrightarrow{\beta }{{X}_{2}}\xrightarrow{\alpha }{{X}_{3}}\xrightarrow{\gamma }{{X}_{4}}\]. If the a tomic number and atomic weight of the parent element X are 72 and 180 respectively then the atomic number and atomic mass of \[{{X}_{4}}\] are respectively:

    A)  \[70,172\]                   

    B)  \[69,171\]

    C)  \[69,172\]                   

    D)  \[68,172\]

    Correct Answer: C

    Solution :

    Series would be follows: \[_{72}^{180}X\xrightarrow{\alpha }_{70}^{176}{{X}_{1}}\xrightarrow{\beta }_{69}^{172}{{X}_{2}}\xrightarrow{\alpha }_{69}^{172}{{X}_{3}}\xrightarrow{\gamma }_{69}^{172}{{X}_{4}}\]

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