AIIMS 2019 Chemistry Ionic Radius MCQ Question

C⁴⁻ is the largest anion among the given options due to its high negative charge, which leads to increased electron-electron repulsion and a larger ionic radius. In contrast, Ω²⁻, F⁻, and N³⁻ have fewer negative charges, resulting in smaller ionic radii compared to C⁴⁻. The greater the negative charge on an anion, the more significant the expansion of its electron cloud, making C⁴⁻ the largest ionic species in this context.