Question

From the given options, choose the one which can form an ionic compound.

• A. O and O
• B. Ba and O
• C. O and Cl
• D. Li and K

Answer 1

The correct option is B Ba and O

Ionic compound is generally formed by the combination of a cation and an anion.
$\bullet$ O and O combine to form a covalent compound by mutual sharing of electrons between the atoms.
$\bullet$ $B{a}^{2+}$ cation and $O^{2–}$ anion combine to form an ionic compound.
$\bullet$ O and Cl both form anions. So, they cannot form an ionic bond between them.
$\bullet$ Li and K both form cations. So, they cannot form an ionic bond between them.