Who among the following made the first observation on Platinum as a catalyst and discovered similar triads of elements that led to the development of the Periodic Table of elements?

Johann Wolfgang Dobereiner

The correct answer is option 3. Johann Wolfgang Dobereiner.

Johann Wolfgang Dobereiner was the scientist who made the first observation on platinum as a catalyst and discovered similar triads of elements. His work on triads involved grouping elements with similar chemical properties into sets of three, where the atomic weight of the middle element was approximately the average of the other two. This concept laid the groundwork for the development of the periodic table of elements.

While Dmitri Mendeleev (option 1) is well-known for his work on the periodic table, Dobereiner's triads predated Mendeleev's periodic table and contributed to its development. Hans Christian Oersted (option 2) and Michael Faraday (option 4) made significant contributions to other areas of science but are not associated with the discovery of similar triads of elements or the development of the periodic table.