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Why is acid rain considered as a threat ...

Why is acid rain considered as a threat to 'Taj Mahal' ?

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Taj Mahal is made of marble. The acid rain contains `H_2SO_4` which attacks the marble `(CaCO_3)`:
`CaCO_3 + H_2SO_4 to CaSO_4 + H_2O + CO_2`
As a result, the marble becomes pitted and weakened mechanically. Therefore, the monument is being slowly eaten away and the marble is getting discoloured and lustreless.
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