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Question: Answered & Verified by Expert
Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point
Chemistrys Block ElementsJEE Main
Options:
  • A $\mathrm{LiCl}$
  • B $\mathrm{NaCl}$
  • C $\mathrm{KCl}$
  • D $\mathrm{RbCl}$
Solution:
2271 Upvotes Verified Answer
The correct answer is: $\mathrm{NaCl}$
Although lattice energy of $\mathrm{LiCl}$ higher than $\mathrm{NaCl}$ but $\mathrm{LiCl}$ is covalent in nature and $\mathrm{NaCl}$ ionic there after, the melting point decreases as we move $\mathrm{NaCl}$ because the lattice energy decreases as a size of alkali metal atom increases (lattice energy melting point of alkali metal halide)

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