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A solution turns blue litmus red and releases gas with a metal carbonate. What type of solution is it?

Answer and explanation

Correct answer: Acidic

Blue litmus turning red is a characteristic test for an acidic solution. A second independent observation supports the same conclusion: acids react with metal carbonates to form a salt, water, and carbon dioxide gas, for example acid + carbonate → salt + H₂O + CO₂. Thus the solution is acidic, making option D correct. A basic or neutral solution would not normally produce this combined indicator pattern.

Related tags

AcidsLitmusMetal-CarbonatesCarbon-DioxideAcid-BaseBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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