Question

Consider the lattice energy of the following compounds
LIF, NaCl, KI, MgF2, MgO
Which of the following is correct order of magnitude of lattice energy?
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Answer 1

Answer:

Pls explain

Explanation:

Answer 2

The correct order of increasing magnitude of lattice energy is as follows.

              KI < NaCl < $MgF_{2}$ < MgO  

Explanation:

Lattice energy is defined as the energy released when formation of 1 mole of an ionic compound occurs due to the combination of its constituent ions.  Hence, more is the magnitude of lattice energy more will be the stability of the ionic compound.

According to Fajan's rule, smaller is the size of cation and larger is the size of anion more will be covalent character. Higher is the covalent character lower will be the lattice energy of compound.

As LiF has high ionic character its lattice energy value is 1016 kJ.

Lattice energy value of NaCl is 787 kJ.

Lattice energy value of KI is 632 kJ.

Lattice energy value of $MgF_{2}$ is 2908 kJ.

Lattice energy value of MgO is 3795 kJ.

Hence, correct order of increasing magnitude of lattice energy is as follows.

              KI < NaCl < $MgF_{2}$ < MgO  

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