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In this case I don't think you look at the electronegativity differences, but at the bonds themselves...HCl is covalently bonded while LiH is has an ionic bond (H takes an electron from the cation Lithium so it can reach the noble gas configuration for He), so I think naturally LiH would have a more ionic character.
LiH is more ionic than HCl because it has a greater difference in electronegativity between the two atoms. Even though hydrogen is at the left of the periodic table, it is actually more electronegative than one might expect. If you look in the chart in the course reader, you can see that hydrogen has an electronegativity of 2.2 and lithium of 1.0 which gives a difference of 1.2. Chlorine has an electronegativity of 3.2, so the difference in electronegativity of HCl is 3.2-1.2=1.0, which is less than the difference in LiH. Since greater differences in electronegativity mean more ionic character, LiH has more ionic character than HCl.
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