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NEET Chemistry The Solid State / ठोस प्रावस्था Question Bank Self Evaluation Test - The Solid State

  • question_answer
    The radius of a calcium ion is 94 pm and of the oxide ion is 146 pm. The possible crystal structure of calcium oxide will be

    A) tetrahedral

    B) trigonal

    C) octahedral 

    D) pyramidal

    Correct Answer: C

    Solution :

    [c] As per formula, \[radius\text{ }ratio=\frac{radius\text{ }of\text{ }cation}{radius\text{ }of\text{ }amon}\] \[=\frac{94}{146}=0.643\] Since the value is between \[0.414-0.732\] hence the coordination no. will be 6 and geometry will be octahedral.


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