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Which substance should a farmer add to acidic soil to reduce its acidity?

Answer and explanation

Correct answer: Slaked lime, Ca(OH)₂

The governing concept is neutralisation: an acidic substance is treated with a suitable base. Slaked lime, Ca(OH)₂, supplies hydroxide ions that react with excess hydrogen ions in acidic soil, reducing its acidity. In simplified form, H⁺ + OH⁻ → H₂O. Dilute hydrochloric acid and carbon dioxide would add to acidity, while sodium chloride is essentially neutral and is not the appropriate corrective material. Thus option A is correct.

Related tags

Acids Bases SaltsSoil TreatmentNeutralisationSlaked LimeAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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