15
The anion part of the N-fertiizer plays prominent role in determining or producing soil acidity. Arrange these N-fertilizers with increasing equivalent acidity.
(A) . Ammonium sulphate
(B) . Ammonium chloride
(C) . Ammonium nitrate
(D) . Ammonium sulphate nitrate
Choose the correct answer from the options given below:
EXPLANATION
Salt-Affected & Problematic Soils Chemistry
- Equivalent Acidity of Ammoniacal Nitrogen Fertilizers:
- Equivalent acidity is defined as parts by weight of calcium carbonate ($ ext{CaCO}_3$) required to neutralize the acid-forming residual effect of $100$ parts of fertilizer:
- Ammonium Nitrate: Equivalent acidity $\approx 60$ $\rightarrow$ (C)
- Ammonium Sulphate Nitrate: Equivalent acidity $\approx 93$ $\rightarrow$ (D)
- Ammonium Sulphate: Equivalent acidity $\approx 110$ $\rightarrow$ (A)
- Ammonium Chloride: Equivalent acidity $\approx 128$ $\rightarrow$ (B)
- Correct Sequence of Increasing Equivalent Acidity: Ammonium nitrate ($60$) $\lt $ Ammonium sulphate nitrate ($93$) $\lt $ Ammonium sulphate ($110$) $\lt $ Ammonium chloride ($128$).
- Conclusion: Sequence is (C), (D), (A), (B), corresponding to Option 2.
Correct option: (2) (C), (D), (A), (B).
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