Five solutions $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$ and $\mathrm{E}$ when tested
Question.
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

solution:

(a) Neutral – Solution D with $\mathrm{pH} 7$

(b) Strongly alkaline – Solution C with pH 11

(c) Strongly acidic – Solution B with $\mathrm{pH} 1$

(d) Weakly acidic – Solution A with $\mathrm{pH} 4$

(e) Weakly alkaline – Solution E with pH 9

The $\mathrm{pH}$ can be arranged in the increasing order of the concentration of hydrogen ions as $11<9<7<4<1$. [/solution]
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