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    Question

    ______ is not used to reclaim acid soils.

    type="a" start="1"> CaCO 3 CaCl2 Gypsum Ca(OH)2
    A a Correct Answer Incorrect Answer
    B b Correct Answer Incorrect Answer
    C c Correct Answer Incorrect Answer
    D d Correct Answer Incorrect Answer

    Solution

    Gypsum is not considered as liming materials because on its application to an acid it dissociates into (Ca2+) and sulphate (SO42-) ions:                               CaSO4 ↔ Ca 2+ + SO42- The accompanying anion is sulphate and it reacts with soil moisture produces mineral acid (H2SO4) which also increases soil acidity instead of reducing soil acidity.

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