NEET Chemistry Chemical Bonding and Molecular Structure / रासायनिक आबंधन एवं आणविक संरचना NEET PYQ-Chemical Bonding Molecular

  • question_answer
    Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is   \[1{{s}^{2}}\text{ }2{{s}^{2}}\text{ }2{{p}^{3}}\], the simplest formula for this compound is                                                                                                                                                              [NEET - 2018]

    A)  \[\text{M}{{\text{g}}_{\text{2}}}\text{X}\]

    B)       \[\text{Mg}{{\text{X}}_{2}}\]

    C)  \[\text{M}{{\text{g}}_{2}}{{\text{X}}_{3}}\]       

    D)       \[\text{M}{{\text{g}}_{3}}{{\text{X}}_{2}}\]

    Correct Answer: D

    Solution :

    [d] Element (X) electronic configuration
    \[1{{s}^{2}}\text{ }2{{s}^{2}}\text{ }2{{p}^{3}}\]
    So, valency of X will be 3.
    Valency of Mg is 2.
    Formula of compound formed by Mg and X will be \[\text{M}{{\text{g}}_{\text{3}}}{{\text{X}}_{\text{2}}}\].


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