Question

Tajmahal, the seventh wonder of the world, is made of white stone. This white stone contains the same substance ‘A’ that is present in chalk powder and lime-stone. It is turning yellow due to polluted air. If it is cleaned by an acidic cleaner, a gas ‘B’ is released, which when passed through a solution ‘C’, forms the same substance which is present in the white stone that was used to make Tajmahal. Gas B is​

Answer 1

Answer:

Agra is a highly populated city. The population leads to many environmental problems like air pollution. The gases emitted from the vehicle, nearby factories and the refinery located at Mathura emit gaseous pollutants which are rich in gases like sulphur dioxide, nitric oxide. This sulphur dioxide when mixed with rain water forms acid rain whose pH is less than 5. This acid rain is very dangerous as it corrodes metals, marbles and stones.