Q. With reference to soil acidity, consider the following statements:
1. It increases when metallic minerals such as calcium, magnesium, potassium and sodium are lost from the soil and only hydrogen ions remain.
2. Land in the North East is naturally acidic.
3. High frequency of heavy rainfall events can worsen the acidification problem.
Which of the statements given above is/are correct?

[A] 1 and 2 only

[B] 2 and 3 only

[C] 1 and 3 only

[D] 1, 2 and 3

Answer: D
Notes:

Statement 1 is correct: Soil acidity increases when metallic minerals such as calcium, magnesium, potassium and sodium are lost from the soil and only hydrogen ions remain. These minerals get removed from soils due to heavy rainfall and flooding. They also get removed with crop residue or harvest hay. 

Statement 2 is correct: Land in the North East is naturally acidic because it receives heavy rainfall every year.  

Statement 3 is correct: Climate change-induced high frequency of heavy rainfall events will further exacerbate the acidification, which will decrease the quality of soil.