Question

Given below are two statements:
Statement (I): Acid sulfate soils can release harmful concentrations of heavy metals such as aluminum, iron, and manganese into the environment under acidic conditions.
Statement (II): Acid sulfate soils are typically characterized by their high organic matter content, which contributes to their fertility and ability to support diverse plant life.

• A. Both Statement (I) and Statement (II) are true.
• B. Both Statement (I) and Statement (II) are false.
• C. Statement (I) is true but Statement (II) is false.
• D. Statement (I) is false but Statement (II) is true.

Hint:

Remember: Acid sulfate soils are chemically active under acidic conditions and can release toxic elements.

Answer 1

The Correct Option is C

Step 1: Pyrite oxidation in these soils produces sulfuric acid and very low pH.
Step 2: Low pH mobilises Al, Fe, and Mn into soil water, confirming Statement I.
Step 3: The resulting acidity and metal toxicity make these soils poor for plant growth, not naturally fertile, so Statement II is false.
Step 4: Statement I true, Statement II false, matching the third option.