The pair of atoms that could form a covalent bond is O (3.5) and CI (3.0) as ClO. Option A is correct.
A covalent bond is a form of chemical bonding that occurs in atoms which includes sharing of electrons pairs.
According to the electronegative difference on the Pauling scale;
- the electronegativity difference of two atoms is said to form a covalent bond if their difference is less than 2.0 but if otherwise, it will form an ionic bond.
From all the options given, only atoms in option A have an electronegativity difference of less than 2.0.
The closer the electronegativity difference of both atoms towards zero, the lesser the polarity between the atoms and the purer the covalent bond.
Learn more about the electronegative difference here:
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