One major cause for destruction of Taj Mahal is :

Options

A. Floods in river Yamuna
B. Air pollution
C. Garbage disposal
D. High temperature

Answer

### Step-by-Step Solution:

1. **Identify the Major Causes of Taj Mahal's Destruction**: The Taj Mahal is facing destruction primarily due to environmental pollution, specifically from nitrogen oxides (NOx) and sulfur oxides (SOx).

2. **Understand the Chemical Reactions**: Nitrogen oxides and sulfur oxides are pollutants that, when released into the atmosphere, can combine with water vapor in the air. This results in the formation of nitric acid (HNO3) and sulfuric acid (H2SO4) through the following reactions:
- NOx + H2O → HNO3 (Nitric Acid)
- SOx + H2O → H2SO4 (Sulfuric Acid)

3. **Formation of Acid Rain**: These acids then mix with rainwater, leading to acid rain. Acid rain has a lower pH and is more corrosive than normal rainwater.

4. **Impact on Taj Mahal's Structure**: The Taj Mahal is primarily made of limestone (calcium carbonate, CaCO3). When acid rain falls on limestone, it reacts chemically, leading to the degradation of the marble structure:
- CaCO3 + H2SO4 → CaSO4 + CO2 + H2O (This reaction shows the breakdown of limestone due to sulfuric acid).

5. **Additional Factors**: Other contributing factors include pollution from nearby industries and the flooding of the Yamuna River, which can exacerbate the deterioration of the monument.

### Final Answer:
One major cause for the destruction of the Taj Mahal is the formation of acid rain due to the reaction of nitrogen oxides and sulfur oxides with rainwater, which leads to the corrosion of its limestone structure.

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