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A farmer finds that the soil has a pH of 5. What should be added to reduce the soil’s acidity for better crop growth?

Answer and explanation

Correct answer: Calcium hydroxide

The pH scale shows that a value below 7 is acidic; therefore, pH 5 indicates acidic soil. To reduce acidity, a suitable base is added so that neutralisation occurs and the pH rises. Calcium hydroxide is a basic compound and can neutralise excess acids in soil, so option C is correct. Hydrochloric acid would increase acidity, while ammonium chloride is an acidic salt. Sodium chloride is essentially neutral and is not the appropriate corrective material.

Related tags

Class 10 ScienceSoil PhNeutralisationAcids Bases SaltsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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