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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsEasy
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Acids change blue litmus paper into which colour?

Answer and explanation

Correct answer: Red

The governing concept is the indicator test for acidic substances. Acids provide hydrogen ions in aqueous solution and turn blue litmus paper red. Therefore option A is correct. Blue is the unchanged colour of the paper, while green and yellow are not the standard litmus result for an acid. This test should be performed with a suitable sample and not by tasting an unknown substance.

Related tags

AcidsBlue LitmusIndicatorsAcids Bases SaltsBasesAnd 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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