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Question
The aqueous solution of one of the following salts will turn red litmus to blue. This salt is:
Options
potassium sulphate
sodium sulphate
sodium chloride
potassium carbonate
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Solution
Potassium carbonate
Explanation:
Turning red litmus to blue requires a basic or alkaline solution. Potassium carbonate (K2CO3) is a basic salt formed from a strong base (KOH) and a weak acid (H2CO3). When dissolved in water, carbonate ions undergo anionic hydrolysis, releasing excess hydroxide ions (OH−), thereby raising the pH above 7 and turning red litmus paper blue.
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