Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively. Which solution is

• (a) Neutral
• (b) Strongly alkaline
• (c) Strongly acidic
• (d) Weakly acidic
• (e) Weakly alkaline

Arrange the pH in increasing order of hydrogen ion concentration ?

pH scale is a numeric scale which is used to determine whether an element is acid, base or neutral.
pH value less than 7 stands for acid.
pH value 7 stands for neutral.
pH value above 7 stands for base.
Therefore,
(a) Neutral : D solution
(b) Strongly Alkaline : C solution
(c) Strongly Acidic : B solution
(d) Weakly Acidic : A solution
(e) Weakly Alkaline : E solution
Increasing order of hydrogen ion concentration:
11<9<7<4<1
ie, C < E < D < A < B