Final answer:
Hydrogen (H) is more electronegative than Lithium (Li), and Chlorine (Cl) is more electronegative than Iodine (I) based on their positions in the periodic table.
Step-by-step explanation:
The question asks about the comparative electronegativity of different pairs of elements. Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself. In each pair, the element that is more to the right and higher up on the periodic table is generally more electronegative.
Answers for specific pairs:
(a) Hydrogen (H) is more electronegative than Lithium (Li).
(b) Chlorine (Cl) is more electronegative than Iodine (I).
Thus, for the pairs provided, hydrogen is more electronegative than lithium, and chlorine is more electronegative than iodine.