Concept explainers
Interpretation:
The compounds from MgO, KI, AgCl which has highest melting points needs to be determined.
Concept introduction:
Molecules are bound together by different types of bonds namely ionic and covalent. Ionic bonds are formed when there is complete transfer of electrons from one atom to another. These atoms either lose or gain electrons to become negatively or positively charged ions. The forces of attraction between these ions causes the ionic bond formation and are strong bonds.

Answer to Problem 74A
The compound MgO has highest lattice energy and hence is one having highest melting point as more energy is required to break the bonds.
Explanation of Solution
Ionic bonds involve the transfer of electrons from one atom to the other. The metal atoms, an electrons donor, loses electrons to form a positively charged ion while the non-metal atoms, electron acceptor, gains electrons to form negatively charged ions. During the process of donating or gaining electrons, the atoms follow octet rule to attain a stable noble gas configuration.
ConsideringMgO, the force of attraction between the
Considering KI, it can be seen that K belongs to Group 1 and Ibelongs to Group 17. The ion
Considering AgCl it can be seen that Ag belongs to Group 11 and Cl belongs to Group 17. The ion
When comparing all the compounds, the one with highest lattice energy is the one having highest melting point because more energy is required to break the bonds so that the compound will melt. As MgO has highest lattice energy, it is the compound with highest melting point.
The compound MgO has highest lattice energy and hence is one having highest melting point as more energy is required to break the bonds.
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