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

Answer and explanation

Correct answer: Blue

Bases change red litmus paper to blue, so option A is correct. Litmus is a natural indicator: acids turn blue litmus red, whereas bases turn red litmus blue. Green is not the usual litmus result for a neutral solution. Exam tip: red litmus turning blue indicates a base.

Related tags

BasesLitmus PaperAcid Base IndicatorsRed LitmusClass 10 ScienceAcidsAnd SaltsAcids Bases And SaltsChemical 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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