Multiple choice

The marble of the Taj-Mahal has turned yellow due to

  1. Rains

  2. direct sunlight

  3. SO2 gas

  4. None of the above

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sulfur dioxide (SO2) reacts with moisture in the air to form sulfuric acid, which causes acid rain. This acid reacts with the calcium carbonate in marble, causing it to yellow and erode.