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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsEasy
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In which of the following aqueous solutions does red litmus paper turn blue?

Answer and explanation

Correct answer: Sodium hydroxide solution

Litmus is an acid-base indicator: a basic solution changes red litmus to blue. Sodium hydroxide dissolves in water and provides hydroxide ions, so its solution is basic; therefore option C is correct. Hydrochloric acid and vinegar are acidic and turn blue litmus red. Distilled water is approximately neutral, so it normally causes no litmus colour change.

Related tags

Acids And BasesLitmus PaperSodium HydroxideIndicatorsAcidsBasesAnd 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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