Question

What is meant by “Marble cancer”?

Answer 1

• Acid rain corrodes the marble of the monuments.
• The acids in acid rain react with the calcium carbonate (${\mathrm{CaCO}}_3$) of marble and degrade it.
• Acidic rain falls on the monument like the Taj mahal got corroded by the harmful chemicals.
• The sulphur dioxide (${\mathrm{SO}}_2$) and nitrogen dioxide (${\mathrm{NO}}_2$) present in the air get deposited on these buildings.
• This phenomenon is called Marble cancer.