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

  • question_answer
    For fcc, if AB is just like the rock salt like structure then, \[{{A}^{+}}\] and \[{{B}^{-}}\] are located at -

    A) \[{{A}^{+}}\]- Tetrahedral voids ; \[{{B}^{-}}\]- Corner

    B) \[{{A}^{+}}\] - Corner and faces; \[{{B}^{-}}\] - Octahedral voids

    C) \[{{A}^{+}}\] - Octahedral voids; \[{{B}^{-}}\]- Corner and faces

    D) \[{{A}^{+}}\] - Corner and faces; \[{{B}^{-}}\] - Octahedral and tetrahedral voids

    Correct Answer: C

    Solution :

    [c] AB is just like \[NaCl\]. Thus twelve \[{{A}^{+}}\] are at edges and 1 within body of fcc i.e. in octahedral voids and six \[{{B}^{-}}\] at faces and 8 at corner.


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