Question

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

Answer 1

SO2,NO2 gases are released into the atmosphere from various sources. These dissolve in rain water to give acid which corrodes marble statues

2SO2+ O2 → 2SO3

H2O + SO3 → H2SO4

2NO2+ H2O → 2HNO3

CaCO3+ H2SO4→ CaSO4 + H2O + CO2

CaCO3+ 2HNO3 → Ca(NO3)2+ H2O + CO2