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

Answer and explanation

Correct answer: Blue

A base changes red litmus paper to blue, so option A is correct. Litmus is a natural indicator that shows different colours in acidic and basic substances. Red litmus turns blue in a basic medium; it does not turn green or yellow. Exam tip: bases turn red litmus blue, whereas acids turn blue litmus red.

Related tags

IndicatorsLitmus PaperBasesAcids Bases And SaltsClass 10 ScienceAcidsAnd 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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