Regular use of which of the following fertilizers increases the acidic strength of soil?

Urea

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Superphosphate of lime

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Ammonium sulphate

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Potassium nitrate

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Solution

The correct option is C
Ammonium sulphate

Ammonium sulphate is a salt of strong acid and weak base. Its aqueous solution is acidic due to hydrolysis of Ammonium ion. Therefore, it will increase the acidic strength of soil.

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