Question

which of the following gases is responsible for yellowing of the taj mahal?
A) Sulphur dioxide
B) Chlorine
C) Sulphur
D) Nitrogen dioxide​

Answer 1

Answer:

Sulphur dioxide

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Answer 2

Sulphur dioxide is the gas responsible for the yellowing of Taj Mahal.

Explanation:

• The Taj Mahal is formed of white marble, which is a metamorphic rock that contains calcite, which is calcium carbonate or limestone.
• The Taj Mahal's colour is turning from white to yellow as a result of increased air pollution.
• Sulphur dioxide is formed when sulphur in factory chimneys combines with moisture and spread into the atmosphere.
• This sulphur dioxide combines with rain water turning it into acidic. Thus, the rain is also called acidic rain.

         S(s)+O2(g)→SO2(g)

         SO2+H2O→H2SO3

         SO3+H2O→H2SO4

• The Taj Mahal's exterior layer which is made up of marble is corroded and destroyed by acid rain, changing its colour and causing fissures in the monument.
• As a result of an acid-base neutralisation reaction, the acids present dissolve the calcium carbonate to generate calcium sulphate, corroding the marble and making it yellow.

         CaCO3+H2SO4→CaSO4+CO2+H2O