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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsEasy
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What colour does red litmus paper turn in a basic solution?

Answer and explanation

Correct answer: Blue

Litmus helps distinguish acidic and basic solutions. A basic solution changes red litmus paper to blue because the alkaline medium produces the characteristic response of the litmus indicator. Hence option B is correct. Red litmus does not remain the expected test colour in a base, and the change is not to white or black. This test should be performed with a suitable indicator strip rather than by touching or tasting an unknown chemical.

Related tags

BasesLitmusIndicatorsAlkaliAcidsAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour
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10 more MCQs
  1. 1What type of substance turns blue litmus paper red?
  2. 2What type of substance turns red litmus paper blue?
  3. 3Which of the following substances acts as a natural indicator?
  4. 4What is the general nature of an aqueous soap solution?
  5. 5Which of the following substances turns red litmus paper blue?
  6. 6What is the nature of a solution whose pH is less than 7?
  7. 7At 25°C, a solution with a pH greater than 7 is of which nature?
  8. 8A student dips red litmus paper into a soap solution. What change will occur in the red litmus paper?
  9. 9Which gas is generally produced when dilute acids react with active metals?
  10. 10A student dips red litmus paper into a soap solution. What will be the colour of the litmus paper?
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