Practicing Success
Which of the following metals cannot be used to absorb \(H_2\) gas on its surface? |
Iron Platinum Palladium Nickel |
Iron |
The correct answer is option 1. Iron. The metal that cannot be used to absorb H₂ gas on its surface is Iron Here's why: Iron: Unlike the other options, iron readily reacts with hydrogen gas to form iron hydrides (\(FeH_2\) and \(Fe_2H_3\)). This reaction effectively consumes the hydrogen and prevents its absorption on the iron surface. Platinum, Palladium, and Nickel: These metals belong to the group of noble metals, known for their low chemical reactivity. They exhibit a phenomenon called hydrogen absorption or chemisorption, where hydrogen molecules dissociate and bond with the metal atoms without forming true chemical compounds. This allows them to "hold" a significant amount of hydrogen on their surfaces. Therefore, while iron reacts with hydrogen, forming hydrides, platinum, palladium, and nickel can absorb it due to their chemisorption ability. |