Which of the following substances has the highest melting point?

C a O

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B i C l_{3}

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K C l

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C l O_{2}

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Solution

The correct option is A $C a O$
Ionic solids have high melting and boiling points. $C a O$ and $K C l$ are ionic solids.

$C a l c i u m o x i d e C a O (2572^{o} C)$ has highest melting point.

The melting points of other substances are $K C l (770^{o} C)$ , $B i C l_{3} (227^{o} C)$ and
$C l O_{2} (59^{o} C)$ .

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