Plovdiv Entrance Practice Test

What type of bonds are formed in the product KH formed from 2 K + H2 → 2 KH?

Hydrogen Bonds Ionic Covalent Polar Covalent Non-Polar

Correct Answer:

Ionic

Explanation:

When a metal like potassium reacts with hydrogen gas, the product forms as an ionic compound. Potassium donates its one valence electron to hydrogen, producing K+ and H−. The strong electrostatic attraction between these oppositely charged ions binds the compound together, which is the essence of ionic bonding. Hydrogen bonds are intermolecular forces between separate molecules and aren’t the type of bond here. Covalent bonds involve sharing electrons between atoms, but in this case the electron transfer creates ions rather than a shared-electron pair. So the correct description is ionic bonding.

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