MgS has a higher melting point than Lil. Hence, option A is correct.
What are ionic compounds?
Ionic compounds contain ions and are held together by the attractive forces among the oppositely charged ions.
MgS is made up of ions with greater charges, it has the higher lattice energy and is the stronger bond.
Lithium iodide is a covalent compound. Therefore, due to the large size of the iodine ion its valence electrons will be loosely held by the nucleus. So, lithium-ion will easily polarize the iodine electrons which results in sharing of electrons.
MgS has a higher melting point than Lil.
Learn more about the ionic compounds here:
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