The aqueous solution of one of the following salts will turn phenolphthalein indicator pink. This salt is:
(a) KCl
(b) K₂SO₄
(c) K₂CO₃
(d) KNO₃

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Solution

(c) K₂CO₃

K₂CO₃ is formed from a weak acid, carbonic acid (H₂CO₃), and a strong base, potassium hydroxide (KOH). On hydrolysis, K₂CO₃ forms more OH^- ions than H⁺ ions, and thus, it is basic. As the aqueous solution of the salt is basic, it turns a phenolphthalein indicator pink.

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A solution turns phenolphthalein indicator pink. The most likely pH of this solution will be :

(a) 6

(b) 4

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The aqueous solution of one of the following salts will turn red litmus to blue. This salt is :

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