127. The concentration of (H⁺) ions is 4 x 10⁻⁵ in a solution. Then pH of the solution will be (Given log 4 = 0.6 ) September 6, 2025 by Admin A. 4.4 B. 5.6 C. 8.4 D. 2.4 ✅ The correct answer is option A.