Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal.
Show Hint
- \(\mathrm{O_3}\) and \(\mathrm{CO_2}\)
- \(\mathrm{CO_2}\) and \(\mathrm{NO_2}\)
- \(\mathrm{SO_2}\) and \(\mathrm{NO_2}\)
- \(\mathrm{SO_2}\) and \(\mathrm{O_3}\)
The Correct Option is C
Solution and Explanation
\(\mathrm{CaCO_3 + H_2SO_4 \rightarrow CaSO_4 + H_2O + CO_2}\)
This corrodes the marble surface and makes it discoloured and lustreless (marble cancer). \(\mathrm{CO_2}\) and \(\mathrm{O_3}\) are not the main cause.
Answer: (3) \(\mathrm{SO_2}\) and \(\mathrm{NO_2}\)
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