Multiple choice

The Taj Mahal is threatened due to the presence of

  1. Chlorine

  2. SO2

  3. Oxygen

  4. Hydrocarbons

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

SO2 reacts with marble (calcium carbonate) to form calcium sulfate and calcium sulfite, which cause yellowing and deterioration of the Taj Mahal's surface. This phenomenon, called marble cancer, occurs due to atmospheric emissions from nearby industries.