According to a law postulated by ______, the amounts of different substances liberated by the same quantity of electricity passing through the electrolytic solution are proportional to their chemical equivalent weights.

Michael Faraday

The correct answer is option 3. Michael Faraday.

According to a law postulated by Michael Faraday, the amounts of different substances liberated by the same quantity of electricity passing through an electrolytic solution are proportional to their chemical equivalent weights. It provides a quantitative relationship between the amount of substance produced during electrolysis and the amount of electric charge passed through the electrolyte. Faraday's Law is fundamental in understanding and quantifying the process of electrolysis and is named after the English scientist Michael Faraday, who formulated it in the early 19th century.