25)
the degree of polarity of a chemical bond in a molecule of a compound can be predicted by determining the difference in the
a) melting points of the elements in the compound
b) electronegativities of the bonded atoms in a molecule of the compound
c) densities of the elements in the compound
d) atomic masses of the bonded atoms in a molecule of the compound

The correct answer is B) electronegativities of the bonded atoms in a molecule of the compound .

Explanation:

When two atoms forming a bond differ in their electronegativities at that time bond polarity is generated

        In simple words a bond will be polar when the bonding electrons are not equally shared by two atoms.As a result the atom attract the bonding electron pair towards itself gain partial negative charge and the other atom gains partial positive charge.

       For HCl is a polar compound because H and Cl atom differ in their electronegativities,as a result the bonding electron pair is not shared equally by H and Cl atoms.