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Question

Arrange CsF, RbF, NaF, KF, and LiF in the decreasing order of lattice energy:

A
LiF>NaF>RbF>KF>CsF
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B
CsF>RbF>LiF>KF>NaF
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C
CsF>RbF>NaF>KF>LiF
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D
LiF>NaF>KF>RbF>CsF
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Solution

The correct option is D LiF>NaF>KF>RbF>CsF
Lattice energy is inversely proportional to the size of the ions involved. Smaller the size of the ions, greater the lattice energy.
The size of cations increases in the following order:
Li+<Na+<K+<Rb+<Cs+
Hence, the lattice energy of the compounds follows the order
CsF<RbF<KF<NaF<LiF

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