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The pH of soil A is 7.5 while that of so...

The pH of soil A is 7.5 while that of soil B is 4.5. Which of the two soils, A or B, should be treated powdered chalk to adjust its pH and why?

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Soil having pH 4.5 should be treated with powdered chalk to adjust its p.H. Soil B is too acidic. Its acidity can be reduced by adding powdered chalk `(CaCO_3)` , which is a base.
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