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JEE Main & Advanced Chemistry The Solid State / ठोस प्रावस्था Question Bank Crystal structure and Coordination number

  • question_answer
    A solid has a structure in which \['W'\] atoms are located at the corners of a cubic lattice \['O'\] atoms at the centre of edges and \['Na'\] atoms at the centre of the cube. The formula for the compound is     [KCET  1996]

    A) \[NaW{{O}_{2}}\]           

    B) \[NaW{{O}_{3}}\]

    C) \[N{{a}_{2}}W{{O}_{3}}\]            

    D) \[NaW{{O}_{4}}\]

    Correct Answer: B

    Solution :

    In a unit cell, W atoms at the corner \[=\frac{1}{8}\times 8=1\]           O atoms at the centre of edges \[=\frac{1}{4}\times 12=3\]            Na atoms at the centre of the cube = 1                                 \[W:O:Na=1:3:1,\] hence formula \[=NaW{{O}_{3}}\]


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