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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsMedium
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Which pair contains substances that can both be used to reduce acidity?

Answer and explanation

Correct answer: Milk of magnesia and slaked lime

Acidity is reduced by a suitable basic substance because it reacts with excess acid in a neutralisation process. Milk of magnesia contains magnesium hydroxide, Mg(OH)₂, and is used as an antacid to neutralise excess stomach acid. Slaked lime, Ca(OH)₂, is basic and can be used to treat acidic soil. Vinegar, lemon juice, hydrochloric acid, and sulphuric acid are acidic, while salt and sugar do not provide the required neutralising action. Hence A is correct.

Related tags

AntacidSlaked-LimeNeutralisation-UsesAcidsBasesAnd 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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