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Why is acid rain considered a threat to...

Why is acid rain considered a threat to Taj Mahal ?

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Marble `(CaCO_(3))` is used in Taj Mahal in bulk. Both sulphuric acid and nitric acid present in acid rain react chemically with calcium carbonate.
`CaCO_(3)+H_(2)SO_(4)rightarrowCaSO_(4)+H_(2)O+CO_(2)`
`CaCO_(3)+2HNO_(3)rightarrowCa(NO_(3))_(2)+H_(2)O+CO_(2)`

This will result in slow errosion as well corrosion of the beautiful scriptures and carvings. Thus, acid rain is a major threat to Taj Mahal.
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Why is acid rain considered as a threat to 'Taj Mahal' ?