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JEE Main levelSingle correct optionDifficulty 2 of 3ev182

Repeated heavy use of ammonium sulfate fertiliser makes soil acidic. The reaction responsible is nitrification, . The soil acidity arises because

  1. Aeach oxidised releases two
  2. Bammonium sulfate is a salt of a strong acid and a strong base
  3. Cnitrate ions react with water to give nitric acid vapour only
  4. Dsulfate ions are reduced to sulfide

Answer: A

Oxidation of ammonium by soil bacteria gives nitrate and two protons per ion, as the balanced equation shows. These protons acidify the soil. Ammonium sulfate is a salt of a weak base and a strong acid, so the first alternative is wrong.
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