Chemistry - Complete s-block Question with Solution | TestHub

Potassium ions (K⁺) are the correct answer, making option (C) the right choice.

In biological systems, K⁺ is the most abundant cation found within intracellular fluids (inside the cells).

It plays a crucial role in activating several metabolic enzymes, such as pyruvate kinase in glycolysis. This enzymatic activation is essential for the successful oxidation of glucose to generate ATP (energy).

Along with sodium, it is also highly responsible for the transmission of nerve signals across cell membranes.