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Question

The lattice energies of NaCl, NaF, KCl and RbCl follow the order:

A
KCl<RbCl<NaCl<NaF
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B
NaF<NaCl<KCl<RbCl
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C
RbCl<KCl<NaCl<NaF
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D
NaCl<RbCl<NaF<KCl
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Solution

The correct option is C RbCl<KCl<NaCl<NaF
Lattice energy is directly proportional to charge of the ion and size of ions.Lattice energy is inversely proportional to size of ion.
As F is smaller in size than Cl so NaF has greater lattice energy than NaCl and as Na+ is smaller in size than K+ so NaCl has greater lattice energy than KCl.
So RbCl<KCl<NaCl<NaF.

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