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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsMedium
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The basic strength of sodium hydroxide solution may decrease if it is left open for a long time. What is the main reason?

Answer and explanation

Correct answer: It reacts with carbon dioxide from air

The governing concept is the reaction of a strong base with an acidic oxide. Sodium hydroxide absorbs carbon dioxide from air and reacts as 2NaOH + CO2 → Na2CO3 + H2O. Some hydroxide ions are therefore converted into carbonate, reducing the available OH− concentration and the solution’s effective basicity. Thus option A is correct; the other changes do not occur in this situation.

Related tags

Sodium HydroxideCarbon DioxideBasicityAcidsBasesAnd 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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