Question

Ionic bonding is seen in:

1. Methane

2. Hydrogen

3. Ammonia

4. Sodium oxide​

Answer 1

Ionic bonding is seen in (4) Sodium Oxide.

Explanation:

• Ionic bonding is the predominant interaction happening in ionic compounds, and it involves the electrostatic attraction between oppositely charged ions or between two atoms with sharply differing electronegativities. Along with covalent and metallic bonding, it is one of the most common types of bonding. Ions are electrostatically charged atoms (or groups of atoms).
• Two sodium cations and one oxygen anion make up sodium oxide molecules $(Na_2O)$, with sodium being metal and oxygen being a non-metallic element. $Na_{2}O$ molecules have two sodium-oxygen ionic connections as a result. Covalent bonding exists in ammonia (polar), hydrogen, and methane.  

Answer 2

The correct option is 4) Sodium oxide

Explanation:

• Ionic bonding is seen in compounds that have a metal atom in it.
• In the given options, methane, hydrogen and ammonia do not have any metal atoms in it.
• Sodium is however a metal. When sodium combines with oxygen to form sodium oxide, an ionic bond is formed.
• Hence, the correct option is 4) Sodium oxide.