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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: Turns it blue

Red litmus paper is an indicator used to test for basicity. When placed in a basic or alkaline solution, it changes from red to blue because the indicator has a different colour in an alkaline medium. Keeping it red would not show the characteristic basic response, and yellow or black are not the standard litmus colours for this test. Therefore option B correctly describes the observation and identifies the solution as basic.

Related tags

BaseRed LitmusIndicatorAlkaline SolutionAcidsBasesAnd 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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