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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsHard
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Phenolphthalein turns pink in an aqueous solution of sodium carbonate. What is the most appropriate reason?

Answer and explanation

Correct answer: Sodium carbonate solution is basic

Sodium carbonate is a salt of a strong base, sodium hydroxide, and a weak acid, carbonic acid. Its carbonate ions hydrolyse in water and produce hydroxide ions, making the solution alkaline. Phenolphthalein is colourless in acidic or nearly neutral conditions but pink in a sufficiently basic solution. Therefore A is correct; not every salt gives a pink colour.

Related tags

Salt-HydrolysisSodium-CarbonatePhenolphthaleinAcidsBasesAnd 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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