Phenolphthalein is a colourless indicator that turns pink in basic solution.

False

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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) $K N O_{3}$

Name an indicator that is pink in alkaline solution but turns colourless in acidic solution.

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