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Question

Regular use of which of the following fertilizers increases the acidity of soil ?
  1. Potassium nitrate
  2. Urea
  3. Superphosphate of lime
  4. Ammonium sulphate

A
Potassium nitrate
B
Urea
C
Superphosphate of lime
D
Ammonium sulphate
Solution
Verified by Toppr

Regular use of ammonium sulphate increases the acidity of soil.
The hydrolusis of ammonium sulphate produces sulphuric acid which increases the acidity of soil.
(NH4)2SO4+2H2O2NH3+2H2O+H2SO4
To prevent acidity, slaked lime is added to neutralize the acid.

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