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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsEasy
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Which of the following solutions will turn red litmus paper blue?

Answer and explanation

Correct answer: Sodium hydroxide solution

The governing concept is the colour response of litmus in basic and acidic media. Sodium hydroxide dissociates in water and produces hydroxide ions, so its solution is basic and changes red litmus to blue. Lemon juice contains citric acid, vinegar contains acetic acid, and hydrochloric acid is also acidic; these substances would turn blue litmus red rather than changing red litmus to blue. Therefore, option C is the only suitable answer.

Related tags

Acids Bases SaltsLitmus IndicatorSodium HydroxideChemical PropertiesClass 10 ScienceAcidsBasesAnd 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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