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The salt whose aqueous solution will turn blue litmus to red is:- ammonium sulphate
- sodium acetate
- sodium chloride
- potassium carbonate
Correct Answer: (a) Ammonium sulphate
Explanation: Litmus turns blue to red in acidic conditions, as the aqueous solution of ammonium sulphate produces H2SO4 acid (strong acid). Therefore, the solution becomes acidic in nature.
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