LMRC AM 2015
⭕ A. Oxygen
⭕ B. Sulphuric acid
⭕ C. Carbon dioxide
⭕ D. Nitrogen
📚 Explanation:
The most common natural source of acidity in water is Carbon dioxide (CO₂).
🔹 CO₂ dissolves in water to form carbonic acid (H₂CO₃).
🔹 This weak acid reduces the pH and is the **major natural contributor** to acidity in rainwater, lakes, rivers, and groundwater.
Why not sulphuric acid?
Sulphuric acid mostly comes from industrial pollution, not natural processes.
The most common natural source of acidity in water is Carbon dioxide (CO₂).
🔹 CO₂ dissolves in water to form carbonic acid (H₂CO₃).
🔹 This weak acid reduces the pH and is the **major natural contributor** to acidity in rainwater, lakes, rivers, and groundwater.
Why not sulphuric acid?
Sulphuric acid mostly comes from industrial pollution, not natural processes.
👉 Therefore, the correct answer is: C. Carbon dioxide
Key Points on Acidity in Water:
- CO₂ + H₂O → H₂CO₃: Forms weak carbonic acid.
- Primary natural acid source: CO₂-driven acidity dominates water bodies.
- Not due to pollution: Sulphuric & nitric acids come from industrial emissions.
