Question

Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal.

• A. $SO_{2}$ and $NO_{2}$
• B. $SO_{2}$ and $O_{3}$
• C. $CO_{2}$ and $NO_{2}$
• D. $O_{3}$ and $CO_{2}$

Answer 1

Answer: (A)

$SO_2$​ and $NO_2$​ are the pollutant gases- which are largely responsible for the discoloured and lustreless nature of the marble of the Taj Mahal. Usually oxides of nitrogen and sulphur cause acid rain which reacts with marble and causes its discolouration.
$CaCO_{3}+H_{2}SO_{4} \rightarrow CaSO_{4}+CO_{2}+H_{2}O$