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Subjects
Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsEasy
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Which statement correctly compares acids and bases?

Answer and explanation

Correct answer: Acids turn blue litmus red and bases turn red litmus blue

The governing concept is the colour response of litmus indicators. Acids change blue litmus to red because they provide H+ ions in water, whereas bases change red litmus to blue because they provide OH− ions or accept protons. Therefore option A states both changes in the correct direction. Option B reverses them, while C and D incorrectly deny indicator effects and the differing pH ranges.

Related tags

LitmusAcid-Base-ComparisonIndicatorsPhAcidsBasesAnd 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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