Question

Five solutions A, B, C, D, and E, when tested with a 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.

Answer 1

$pH\uparrow [H^{+}{]}_{conc.}\downarrow$

$[H^{+}{]}_{conc.}\uparrow$ Acid Strength$\uparrow$

$B\to$ Strongly Acidic

$A\to$ Weakly Acidic

$D\to$ Neutral $[pH=7]$

$E\to$ Weakly Alkaline

$C\to$ Strongly Alkaline

So, $[H^{+}{]}_{conc.}$ is $B>A>D>E>C$