Question

what is the role of neutralization process in the discoloration of taj mahal and make a short report
Focus areas:
1.Components of acid rain and its sources.
2.The process of neutralisation involves in the Taj's discolouration,what act as a base and what as an acid?
3. Which other monuments of the world and India facing similar threats as the Taj?

Answer 1

Taj Mahal is turning yellow because of the increase in atmospheric pollution and excessive dust from factories. The yellow color is because of the sulphur dioxide present in air.

Acid rain is responsible for corroding of Taj Mahal.

This mainly happens because of oxidation.......

Answer 2

When sulfuric and nitric acids react with calcite in polluted air and rain as well as marble, it is dissolved, resulting in discoloration of Taj Mahal.

• Acid rain is a result of emission of nitrogen oxide and sulphur oxide in the atmosphere by increasing the precipitation. The major emitters include the oil refineries, the electric power generators and air pollution.

• Tajmahal is vulnerable to acid rain as it is made of marble ie. majorly calcium carbonate. Decades of exposure to acid rain can lead the monument to lose its details. The base here is the marble, which gets corroded by sulphur and thus turns yellow.

• The other monuments that are getting detiriorated due to acid rain are Longmen Grottoes, China and Athens Acropolis.