A solution turns phenolphthalein indicator pink. The most likely pH of this solution will be:
(a) 6
(b) 4
(c) 9
(d) 7

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Solution

(c) 9

Every substance with a pH greater than 7 is considered basic or alkaline. Basic or alkaline solutions turn phenolphthalein indicator pink. Thus, the pH of the solution is most likely 9.

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An element X reacts with water to form a solution which turns phenolphthalein indicator pink.The element X is most likely to be:

(a) sulphur

(b) sodium

(d) silicon

The aqueous solution of one of the following salts will turn phenolphthalein indicator pink. This salt is :

(a) $K C l$

(b) $K_{2} S O_{4}$

(d) $K N O_{3}$

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