Which one of the following elements is unable to form MF63.

  1. A

    Ga 

  2. B

    AI

  3. C

    B

  4. D

    In 

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    Solution:

    Boron has no vacant d-orbitals, thereby cannot extend its covalency. While In, Al, and Ga have vacant d-orbitals, therefore can extend its covalency. In MF63-, central metal, M accommodate six F atoms which can done by Al, In, and Ga. As boron has no d-orbitals, therefore it forms BF4-.

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