Marble statues often slowly get corroded when kept in open for a long time.Assign a suitable explanation.

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Solution

The gaseous oxides (CO₂, NO₂ and SO₂) present in the air as chemical pollutants mix with water in air to form acids such as carbonic acid, nitric acid and sulphuric acid.This acid comes down as acid rain and cause corrosion of marble statues. Calcium carbonate present in marble is transformed into other compounds by reaction with acids as follows:
CO₂ + H₂O + CaCO₃ â†’ Ca(HCO₃)₂
CaCO₃ + H₂SO₄ â†’ CaSO₄ + CO₂ + H₂O
The compounds formed are water soluble and are easily washed away.
Blackening of marble surfaces is due to the presence of carbonate, sulphate and nitrate salts.

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Marble statues often slowly get corroded when kept in open for a long time.Assign a suitable explanation.

CO2 + H2O + CaCO3 â†’ Ca(HCO3)2

CaCO3 + H2SO4 â†’ CaSO4 + CO2 + H2O

The compounds formed are water soluble and are easily washed away.

Blackening of marble surfaces is due to the presence of carbonate, sulphate and nitrate salts.

CO₂ + H₂O + CaCO₃ â†’ Ca(HCO₃)₂

CaCO₃ + H₂SO₄ â†’ CaSO₄ + CO₂ + H₂O