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

Answer and explanation

Correct answer: Blue

The relevant concept is the litmus indicator test for bases. A basic solution changes red litmus paper to blue because its alkaline nature interacts with the indicator. Thus option B is correct. Red is the original colour of the test paper, while yellow and orange are not the characteristic result for a base in the standard litmus test. Indicators should be used safely rather than identifying an unknown chemical by tasting it.

Related tags

BasesRed LitmusIndicatorsAcids Bases SaltsAcidsAnd 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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