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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsEasy
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A solution turns red litmus blue and phenolphthalein pink. Which could it be?

Answer and explanation

Correct answer: Sodium hydroxide solution

The governing concept is the indicator test for a base. A basic solution changes red litmus to blue and turns colourless phenolphthalein pink. Sodium hydroxide dissolves in water to give an alkaline solution, so option A satisfies both observations. Lemon juice and vinegar contain acids and would show the opposite litmus behaviour, while soda water is mildly acidic because dissolved carbon dioxide forms carbonic acid; it would not normally turn phenolphthalein pink.

Related tags

BasesIndicator TestsSodium HydroxideAcidsAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience
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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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