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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsEasy
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What effect does a basic solution have on red litmus paper?

Answer and explanation

Correct answer: Red litmus turns blue

The governing concept is the use of litmus as an acid-base indicator. A basic solution produces hydroxide ions in water and changes red litmus to blue, so option B is correct. Option C is the characteristic response of blue litmus to an acid. Options A and D do not describe the normal result of testing a basic solution with red litmus.

Related tags

BasesLitmusIndicatorsAlkalisClass10AcidsAnd SaltsAcids Bases And SaltsChemical 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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