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

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TestHub · Accepted Answer

Industries present nearby Taj Mahal produce a lot of $N O_{2}$ and $S O_{2}$ gases which react with water, oxygen and other chemicals to form sulphuric acid and nitric acid. These then mix with water and make the rain acidic which than react with marble to decolourise it as follows
$C a C O_{3} + H_{2} S O_{4} \to C a S O_{4} + C O_{2} + H_{2} O$

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