(a) Name two acids that are usually present in rain water.

(b) How these acids affect our heritage monuments such as Taj Mahal?

(a) Sulphuric acid (H₂OS₄) and Nitirc acid (HNO₃) are present in acid rain. Sulphur oxides and oxides of nitrogen combine with water and oxygen in air and fall on earth as acid rain in the form of Sulphur and nitric oxides.

(b) Sulphur and nitric oxides present in acid rain corrode the marble, limestone, sandstone. When acid rain falls on them it breaks them down into fine powdery substances which is later washed away by rain.

Taj mahal that is made of marble is being corroded by acid rain as the acid rects with the marbles.