आम्लयुक्त पर्जन्य म्हणजे काय ?

The correct answer is Option B (Contains 60 or 70% Sulphur Dioxide and 40 or 30% Nitrogen Oxide).

Key Points:
• Atmospheric Chemistry of Acid Rain:
• Composition: Acid precipitation is primarily caused by atmospheric emissions of Sulphur Dioxide (SO₂) and Nitrogen Oxides (NOx) emitted from fossil fuel combustion, thermal plants, and automobiles.
• Proportional Share: In typical acid rain chemistry, Sulphuric acid (derived from SO₂) contributes about 60% to 70%, while Nitric acid (derived from NOx) contributes about 30% to 40% of the total acidity.
• Reactions:
• SO₂ + H₂O → H₂SO₄ (Sulphuric Acid)
• NO₂ + H₂O → HNO₃ (Nitric Acid)
• pH Value: Normal rainwater has a pH of ~5.6; acid rain typically has a pH below 5.6 (often 4.0–4.5), causing damage to soils, forests, aquatic ecosystems, and stone monuments (e.g., marble cancer on the Taj Mahal).
• Key Takeaway: Acid rain typically comprises 60–70% Sulphur Dioxide and 30–40% Nitrogen Oxides forming strong acids.