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    8.

    Solid NaCl is a bad conductor of electricity because:

    A

    The ions are held in fixed positions and cannot move.

    B

    NaCl is a non-polar compound.

    C

    The electrons in NaCl are tightly bound to their respective ions.

    D

    NaCl does not contain any free electrons.

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    10.

    Which substance has the greatest ionic character?

    A

    Cl2O{\rm{C}}{{\rm{l}}_2}{\rm{O}}

    B

    NCl3{\rm{NC}}{{\rm{l}}_3}

    C

    PbCl2{\rm{PbC}}{{\rm{l}}_2}

    D

    BaCl2{\rm{BaC}}{{\rm{l}}_2}

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