pH value of 0.1N HCl solution is approximately:

Correct answer: (b) 1.0

Explanation

HCl is a strong acid that fully dissociates, so a 0.1 N solution gives [H⁺] = 0.1 mol/L.

Using pH = –log[H⁺], we get pH = –log(0.1) = 1.0.

Values like 10 or 11 are basic and wrong for an acid; 2.0 would fit only ~0.01 N HCl.