WAEC Chemistry 2023 Objective — Question 22

Question 22 of 50 from the West African Examinations Council (WAEC) Chemistry 2023 Objective paper, with the correct answer and a full explanation.

The periodic property that is used to determine whether a covalent molecule is polar or not is

A. atomic radius
B. electron affinity
C. electronegativityCorrect
D. ionization energy

Explanation

Electronegativity is used to investigate the nature of a bond: if the difference between the electronegativities of the bonded atoms is less than 0.5, the bond is non-polar covalent; from 0.5 to 1.7, it is polar covalent; greater than 1.7, it is ionic.

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