The pair of elements that could not react to form an ionic compound is C and O (option B).
What are ionic compounds?
Ionic compounds are formed by the electrostatic interaction of the metal atom with a non-metal. The ionic bonds are weaker bonds and are easily dissociated in the water.
When two elements with opposite charges are combined, a type of bond called ionic bond is formed. Ionic bonds are type of chemical bond where two atoms or molecules are connected to each other by electrostatic attraction.
Carbon and oxygen are two nonmetallic elements, hence, cannot form ionic or electrostatic bond with one another.
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