Reasons for Damage to the Taj Mahal at Agra
The pollutants in the air consist of nitrogen oxides, hydrogen sulphide, and sulphur dioxide. The sulfur dioxide and nitrogen oxides in the atmosphere react with water (falling as rain), and get converted into sulphuric and nitric acids (with water, oxygen, and other chemicals). The marble of the Taj Mahal is composed of calcium carbonate. So, when the sulphuric acid and nitric acid react with the calcium carbonate, it decolorizes the white color of the surface to pale yellow. Thus, damaging the Taj Mahal.
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Taj Mahal at Agra may be Damaged by
(a) Sulphur dioxide
The Correct Option is (a)