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

Question

Canvas Classes · Accepted Answer

Melting point of ionic compounds increases with lattice energy (higher charge, smaller ions → higher lattice energy → higher melting point).

Step 1 — LiF vs LiCl:
- LiF: smaller F⁻ → higher lattice energy → higher melting point
- LiF (848°C)  LiCl (605°C) ✓

Step 2 — MgO vs NaCl:
- MgO: Mg²⁺ and O²⁻ (both divalent) → much higher lattice energy
- MgO (2852°C)  NaCl (801°C)
- MgO  NaCl ✓

Correct pair: LiF  LiCl AND MgO  NaCl

Answer: Option (4)

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