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What type of substance turns blue litmus paper red?

Answer and explanation

Correct answer: Acid

Litmus is an acid–base indicator. In an acidic medium, blue litmus changes to red, so option A, acid, is correct. A base shows the opposite familiar change by turning red litmus blue. A neutral salt solution or water generally produces no characteristic litmus-colour change under ordinary conditions, so options C and D do not explain the stated observation.

Related tags

ScienceClass 10Acids Bases SaltsLitmus IndicatorAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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