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 - Science

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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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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. 

Concept: Salts
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Lakhmir Singh Class 10 Chemistry (Science)
Chapter 2 Acids, Bases and Salts
Q 62 | Page 99
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