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

Answer and explanation

Correct answer: Sodium hydroxide solution

Sodium hydroxide solution contains hydroxide ions and is strongly basic. A base changes red litmus paper to blue, so option C gives the stated observation. Lemon juice contains citric acid, vinegar contains acetic acid, and hydrochloric acid is also acidic; these substances do not turn red litmus blue. They generally turn blue litmus red instead. Therefore, sodium hydroxide solution is the unambiguous correct answer.

Related tags

ScienceClass10Acids-Bases-SaltsLitmusSodium-HydroxideAcidsBasesAnd 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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