Question:
The correct order of melting points of the following salts is:
LiCl & (I)
LiF & (II)
LiBr & (III)
The correct order of melting points of the following salts is:
LiCl & (I)
LiF & (II)
LiBr & (III)
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The melting point of ionic compounds decreases as the anion size increases because larger anions lead to weaker lattice energy.
Updated On: Mar 24, 2025
- \(I>II>III\)
- \(II>I>III\)
- \(III>II>I\)
- \(II>III>I\)
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The Correct Option is B
Solution and Explanation
Step 1: Understanding Melting Point Trends in Ionic Compounds
The melting point of an ionic compound depends on: 1. Lattice Energy: Higher lattice energy means a higher melting point. 2. Size of the Anion: Smaller anions lead to stronger lattice energy.
Step 2: Analyzing the Given Salts
Fluoride (F$^-$) is the smallest anion, followed by chloride (Cl$^-$) and bromide (Br$^-$).
The order of lattice energy is: \[ LiF>LiCl>LiBr \] Since lattice energy determines melting point, we get: \[ LiF>LiCl>LiBr \]
Step 3: Correct Answer
Thus, the correct order is: \[ {\(LiF (II)>LiCl (I)>LiBr (III)\)} \] Thus, the correct answer is (B).
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