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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsEasy
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What colour does blue litmus turn in an acidic solution?

Answer and explanation

Correct answer: Red

The governing concept is the indicator test for acids and bases. Litmus is a natural acid–base indicator: in an acidic solution, blue litmus changes to red because the acidic medium affects the indicator dye. Blue is the unchanged colour in a neutral or non-acidic condition, while yellow and green are not the standard litmus result. Hence, option A, red, is correct.

Related tags

AcidsBasesLitmusIndicatorsAnd 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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