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The correct set from the following in which both pairs are in correct order of melting point is:

1. LiF > LiCl; MgO > NaCl
2. LiCl > LiF; NaCl > MgO
3. LiF > LiCl; NaCl > MgO
4. LiCl > LiF; MgO > NaCl

Correct answer: LiF > LiCl; MgO > NaCl

Solution

The correct option indicates that LiF has a higher melting point than LiCl due to stronger ionic bonds in LiF, and MgO has a higher melting point than NaCl because of its greater charge density and stronger ionic interactions.

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