AIIMS 2014 Chemistry Acid-Base Chemistry MCQ Question

The correct answer is C) F⁻ because the strength of a conjugate base is inversely related to the strength of its corresponding acid. Fluoride (F⁻) is the conjugate base of hydrofluoric acid (HF), which is a relatively weak acid. In contrast, the other options (Cl⁻, Br⁻, I⁻) are conjugate bases of stronger acids (HCl, HBr, HI), making them weaker bases than F⁻. Thus, F⁻ is the strongest conjugate base among the given choices.