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a
LiF
b
NaCl
c
LiCl
d
MgO
answer is D.
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Detailed Solution
Lattice energy is directly proportional to the charges and inversely proportional to the inter nuclei distance.-3795 kJ/mole is the lattice energy of MgO, other all are below this value. However we cant memorize the value of lattice energy, so depend on charge.