Final answer:
The most dilute solution among A) 1M, B) 0.5 M, C) 0.02 M, and D) 0.0005 M is D) 0.0005 M, as it has the lowest molarity, indicating the lowest concentration of solute per liter of solution. Therefore correct option is D
Step-by-step explanation:
Dilution refers to the process of reducing the concentration of a solute in solution, usually by mixing with more solvent. In this context, we are comparing the molar concentrations (M) of different solutions to determine which one is the most dilute. The molarity (M) is the number of moles of solute per liter of solution, and the greater the molarity, the more concentrated the solution is.