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  4. Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest pH value?

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Q. Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest $pH$ value?

AIPMTAIPMT 2012Equilibrium

Solution:

Hint- Study about the strength of acids and bases.
Concept-
Acids and bases can be differentiated based on their strength as weak
and strong.
Correct option-
Option $C$ is correct.
Explanation-
$BaCl _2$ is made up of strong base $Ba ( OH )_2$ and strong acid $HCl$.
$AlCl _3$ is made up of weak base $Al ( OH )_3$ and strong acid $HCl$.
$LiCl$ is made up of weak base $LiOH$ and strong acid $HCl$.
$BeCl _2$ is made up of weak base $Be ( OH )_2$ and strong acid $HCl$.
$Ba ( OH )_2$ is strongest base among the given options thus have maximum pH.