JEE Main levelSingle correct optionDifficulty 2 of 3ev182
Repeated heavy use of ammonium sulfate fertiliser makes soil acidic. The reaction responsible is nitrification, NHX4X++2OX2NOX3X−+2HX++HX2O. The soil acidity arises because
Aeach NHX4X+ oxidised releases two HX+
Bammonium sulfate is a salt of a strong acid and a strong base
Cnitrate ions react with water to give nitric acid vapour only
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.