Which substance has the highest melting point?

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$MgO$

${Li}_{2} O$

$N_{2} O_{5}$

${CO}_{2}$

answer is B.

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Detailed Solution

Magnesium and oxygen atoms have far stronger charges than other atoms, which results in a strong attraction between them. As a result, they have very high lattice energy, and it takes a lot of energy to break this lattice. $MgO$ has a high melting point as a result.

So, $MgO$ substance has the highest melting point.

Hence, option B is correct.

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