. Among the following, which compound will show the highest lattice energy


(a) KF

(b) NaF

(c) CsF

(d) RbF

Best Answer

Correct Option is: B

Concept: LATTICE ENERGY  ∝ Charge ∝1/ size

Lattice energy is directly proportional to charge and inversely proportional to size. For compounds containing ions of the same charge, lattice energy increases as the size of ions decreases.In the options given above all the compounds belong to the same family. Hence, all of them have +1 charge. So the compound with the highest lattice energy will have the smallest size. Thus, NaF has the highest lattice energy.

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