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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsMedium
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Sodium carbonate solution turns red indicator paper blue. What is the reason?

Answer and explanation

Correct answer: The solution is basic

The governing concept is the colour change of acid–base indicators. Red litmus or a comparable red indicator turns blue in a basic medium. Sodium carbonate is a salt of a strong base and a weak acid; its carbonate ions hydrolyse in water and generate hydroxide ions, so the solution is basic. Therefore option A is correct. It is not strongly acidic, ion-free, or pure water.

Related tags

Sodium CarbonateBasic SaltIndicatorHydrolysisAcidsBasesAnd 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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