Question

Taj Mahal is threatened by pollution from
(A) Chlorine
(B) Sulphur dioxide
(C) Hydrogen
(D) Oxygen

Answer 1

Hint: Taj Mahal is threatened by the pollution of the gases whose formula is $S{O}_2$. It is a toxic gas and is also responsible for the smell which comes when the matchstick is burned. It has the ability to prevent oxidation.

Complete step-by-step answer:
Taj Mahal is threatened by pollution from Sulphur dioxide. Sulfur dioxide reacts with the water molecules present in the atmosphere and forms the sulphuric acid which gets precipitated through acid rain and affects the monument by changing its colour and also making cracks in the monuments. The acid rain can digest and destroy the outer layer of the monuments like the Taj Mahal. The main cause of Sulphur dioxide presence near the Taj Mahal is the Mathura Refinery which is situated near to it. It was recently found that the air has high levels of suspended particulate matter, caused by factory emissions, dust, construction, and exhaust from automobiles.
So, the correct answer is ‘Sulphur dioxide’.

Additional Information: Mathura Refinery is located about 50 kilometers away from the Taj Mahal. Sulfur dioxide is released naturally by volcanic activity. Sulfur dioxide is also produced as a by-product of copper extraction and the burning of fossil fuels contaminated with sulfur compounds. These gases leave yellowish marks on the monument hence degrading its beauty.

Note: Sulphur dioxide is usually used as a preservative for many edibles like dried apricots, dried figs, and other dried fruits, because of its antimicrobial properties and its ability to prevent oxidation. Sulfur dioxide is also used as a refrigerant because of being easily condensed and possessing a high heat of evaporation.