Question

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

• A. $C{S}_2$
• B. $HI$
• C. $H_{2}S$
• D. $H_{2}O$
• E. $MgO$

Answer 1

The correct option is E $MgO$

Option $E$ is the correct answer. $MgO$ is an ionic compound. It is formed by the transfer of electrons from Magnesium to Oxygen and thus it forms a cation and an anion. In general, ionic compounds have more melting point than covalent compounds. The rest of the compounds in the question are covalent where they form compounds by mutual sharing of electrons between the atoms. And hence all the other compounds have low melting point. $MgO$ being the only ionic compound has higher melting point.