What are strong electrolytes?

Almost completely ionized.

The correct answer is: 1. Almost completely ionized.

Strong electrolytes are substances that completely or almost completely ionize into ions when dissolved in a solvent such as water. In a solution of a strong electrolyte, the majority of the solute particles break down into ions, which makes the solution a good conductor of electricity.

Examples of strong electrolytes include strong acids (e.g., HCl, HNO₃, H₂SO₄) and strong bases (e.g., NaOH, KOH) when dissolved in water. These substances undergo extensive ionization, resulting in the formation of a large number of ions in the solution.

On the other hand, weak electrolytes are substances that only partially ionize into ions when dissolved in a solvent. They form a relatively small number of ions in the solution, leading to lower electrical conductivity compared to strong electrolytes.

Option 1. Almost completely ionized, accurately describes strong electrolytes.