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Which of the following substances has …

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Which of the following substances has the highest melting point? A)NaCl B)KCl C)MgO D)BaO

    • Posted by Gatha Vinod 4 years ago

    CBSE > Class 11 > Chemistry
    • 1 answers

    Shadow Eye 4 years ago

    MgO has a high melting point because of the difference in lattice energy. They all have the same FCC lattice structure, but the lattice energy of MgO is roughly 4 times that NaCl and KCl because it is proportional to Z+.Z- Since lattice energy is disproportional to this distance, that could be why the lattice energy of MgO is larger than that of BaO.

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