RAJASTHAN PMT Rajasthan - PMT Solved Paper-1999

  • question_answer
    If two elements X and Y have 3 and 6 electrons in its outer most shell, then the molecular formula of compound formed by the combination of X and Y:

    A)  \[XY\]                                  

    B)                         \[{{X}_{3}}Y~\]

    C)                         \[{{X}_{2}}Y\]                   

    D)                         \[{{X}_{2}}{{Y}_{3}}\]

    Correct Answer: D

    Solution :

    \[X\] has 3 electron so it forms \[{{X}^{+3}}\] ion while Y has 6 electron in its outer most shell therfore it forms \[{{Y}^{-2}}\] ion. \[{{X}^{+3}}+{{Y}^{-2}}\xrightarrow{{}}{{X}_{2}}{{Y}_{3}}\]


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