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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsEasy
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A farmer finds that the soil has a pH of 5. Which substance should be added to the soil to raise its pH for better crop growth?

Answer and explanation

Correct answer: Quicklime (CaO)

The pH scale shows that a pH below 7 represents an acidic substance; therefore, soil with pH 5 is acidic. Quicklime, CaO, is a basic oxide. In moist soil it forms calcium hydroxide, which neutralises excess acidity and raises the pH toward a more suitable range. HCl would increase acidity, while ammonium chloride is an acidic salt and sodium chloride is not the appropriate corrective material. Option A is correct.

Related tags

Soil PhAcidic SoilQuicklimeNeutralisationAcids And BasesAcidsBasesAnd 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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