Can you conceive of a situation or find an example wherein two compounds with equivalent melting points form a mixture that is non-covalentwith a higher melting point than the individual constituents?

Ionic bonds are stronger than covalent bonds and therefore require more energy to break.

No, boiling points are always higher than melting points. When you turn a solid to a liquid, this process is called melting, and requires a lower temperature than boiling the substance. Take ice...

no because freezing points are below freezing and the lower it gets< the hotter it is

they are the same... dont know who wrote this but it can be the same such as dry ice, or different such as water. however boiling point will sometimes be higher than melting point

no, metals have higher melting points than non metals because metals are ductile, malleable and sonorous or produce a striking sound when struck.