Five solutions A, B, C, D and E when tested with universal indicator, shoed pH as 4, 1, 11, 7 and 9 , respectively. The pH in increasing order of H+ ion concentration for the solution is:

Correct option is C

The correct answer is (c) C < E < D < A < B
Explanation:
The pH scale ranges from 0 to 14, where:
· pH < 7: Acidic (Higher H+ ion concentration).
· pH = 7: Neutral.
· pH > 7: Basic (Lower H+ ion concentration).
The given pH values of the solutions are:
· A = 4 (acidic).
· B = 1 (highly acidic).
· C = 11 (basic).
· D = 7 (neutral).
· E = 9 (basic).
Rule:
H+ ion concentration is inversely proportional to the pH value: Lower the pH, higher the H+ ion concentration.
Order of pH values (increasing H+H^+H+ concentration):
· C (pH = 11) → E (pH = 9) → D (pH = 7) → A (pH = 4) → B (pH = 1).