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A student dips red litmus paper into a soap solution. What colour will it turn?

Answer and explanation

Correct answer: Blue

The governing concept is the indicator test for bases. Soap solution is generally alkaline because soap undergoes hydrolysis in water and produces an alkaline medium. Bases change red litmus paper to blue, so option B is correct. Red would indicate no relevant change, green is associated with some universal-indicator readings rather than ordinary litmus paper, and colourless is not the expected litmus response. The result assumes a normal aqueous soap solution.

Related tags

ScienceClass10Acids-Bases-SaltsLitmusSoap-SolutionIndicatorsAcidsBasesAnd SaltsAcids Bases And Salts

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