Explain the following: (a) Lithium iodide is more covalent than lithium fluoride (b) Lattice enthalpy of LiF is maximum among all the alkali metal halides.

Explain the following: (a) Lithium iodide is more covalent than lithiu

1.	Explain the following: (a) Lithium iodide is more covalent than lithium fluoride (b) Lattice enthalpy of LiF is maximum among all the alkali metal halides.
Answer» Solution :According to Fazan.s rule, `Li^(+)` ION can polarise `I^(-)` ion more than the `F^(-)`ion due to bi size of the anion. Thus `Lil^(-)` has more COVALENT character than Lif. (b) SMALLER the size (internuclear DISTANCE), more is the value of lattice enthalpy since internuclear distance is expected to be least in the LiF.