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Which of the following compounds would be expected to have the highest melting point?

Which of the following compounds would be expected to have the highest melting point? Correct Answer BaF2

Higher ionic character of bonds corresponds to the ionic potential of the cations. Higher the charge by size (smaller the size) ratio of cation, more strongly ionic compound it is and, so higher is the melting point. Thus, BaF2 has the highest melting point.

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