What is the effect of dilution on the conductivity of the solution?

Decreases

The answer is 2. Decreases.

The conductivity of a solution is the ability of the solution to conduct electricity. It is measured in Siemens per meter (S/m). The conductivity of a solution depends on the number of ions present in the solution. The more ions present in the solution, the higher the conductivity.

When a solution is diluted, the number of ions per unit volume decreases. This is because the volume of the solution increases, but the number of ions remains the same. Therefore, the conductivity of the solution decreases when it is diluted.