Dihydrogen As A Fuel

Ninhydrin is commonly used in paper chromatography to detect amino acids. When it reacts with amino acids, it typically produces a purple or blue color. However, there are exceptions, such as proline. Proline, a cyclic amino acid, reacts with ninhydrin to give a yellow color instead of the usual purple or blue color. This unique reaction is due to the structure of proline, which affects the ninhydrin reaction. Therefore, the correct answer is Proline.

The antifluorite structure is a type of crystal structure that is the inverse of the fluorite structure. In this structure, the anions (oxygen ions in this case) occupy the positions normally occupied by cations in the fluorite structure, and vice versa. Sodium oxide ( ) crystallizes in the antifluorite structure, where oxide ions ( )occupy the tetrahedral sites, and sodium ions (Na+) occupy the cubic sites.

The inert pair effect refers to the tendency of the s-electrons to remain non-bonding or less reactive in heavier elements. Lead (Pb), being a heavier element, exhibits a more pronounced inert pair effect than germanium (Ge). This effect makes Pb(II) more stable and less likely to undergo oxidation to Pb(IV), whereas Pb(IV) is more prone to reduction. In contrast, Ge(II) compounds are more reactive and easily oxidized to Ge(IV), making them powerful reducing agents. The inert pair effect is the dominant reason for the contrasting behavior of Ge and Pb in their respective oxidation states.