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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsEasy
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What change occurs when red litmus is added to a sodium hydroxide solution?

Answer and explanation

Correct answer: Red litmus turns blue

Sodium hydroxide dissolves in water to give a strongly basic solution containing hydroxide ions. Bases change the indicator litmus from red to blue, so the red litmus paper becomes blue when it contacts sodium hydroxide solution. The change is an indicator response, not a gas-producing reaction; bubbles are unnecessary. A base does not normally make red litmus colorless or green. Thus option A is the only correct observation.

Related tags

Sodium HydroxideBaseLitmus IndicatorAcidsBasesAnd 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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