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(B) The $pH$ scale measures the acidity or basicity of an aqueous solution. Distilled water is neutral with a $pH$ of $7$. $NH_3$ (ammonia) is a weak

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$NH_3$ solution in water

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(B) The $pH$ scale measures the acidity or basicity of an aqueous solution. Distilled water is neutral with a $pH$ of $7$. $NH_3$ (ammonia) is a weak base. When dissolved in water,it undergoes the reaction: $NH_3 + H_2O \rightleftharpoons NH_4^+ + OH^-$. This reaction increases the concentration of $OH^-$ ions,making the solution basic $(pH > 7)$. $NH_3$ gas itself does not have a $pH$ until dissolved in water. Water saturated with $Cl_2$ forms $HCl$ and $HOCl$,making the solution acidic $(pH Therefore,the $NH_3$ solution in water has the highest $pH$ among the given options.

The one which has the highest value of $pH$ is

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