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A student dips red litmus paper into a soap solution. What will be the colour of the litmus paper?

Answer and explanation

Correct answer: It will turn blue.

A soap solution is generally alkaline because soap produces basic ions in water. The governing indicator rule is that bases turn red litmus paper blue; therefore, option A is correct. Green is not the standard result for red litmus, colourless is not expected, and red would remain only in an acidic or neutral medium.

Related tags

Acids Bases SaltsLitmus PaperSoap SolutionBasesIndicatorsAcidsAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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