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After testing soil and finding it acidic, a student recommends adding lime to it. What is the main reason for this recommendation?

Answer and explanation

Correct answer: Lime neutralises the acidity of soil and raises its pH

The governing concept is neutralisation. Lime, commonly supplied as calcium oxide or calcium hydroxide, is basic, whereas acidic soil contains excess acidic substances. The base reacts with and neutralises that acidity, so the soil pH rises towards a more suitable range for plant growth. Option A is therefore correct. Options B, C and D describe effects that are not the purpose of liming acidic soil.

Related tags

AcidsBasesSoil PhNeutralisationLimeAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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