Question

(a) Name the purest form of water occurring in nature.

(b) Is the above form of water 100% pure? If not, name the impurities which are generally present in it.

(c) Name two more impurities which dissolve in the above form of water in industrial regions. How do these impurities harm?

Answer 1

(a) The purest form of water occurring in nature is rainwater

• It is obtained from natural vaporization by the sun.
• The impurities and salts are left behind on the earth and a pure form of water is obtained in the form of rainwater.

(b) No, rainwater is not 100% pure. Impurities present in rainwater are

• Dust and dissolved gases like Oxygen($\mathrm{O}$), Nitrogen($\mathrm{N}$), and Carbon dioxide(${\mathrm{CO}}_2$)

(c) Sulfur dioxide(${\mathrm{SO}}_2$) and Nitrogen dioxide(${\mathrm{NO}}_2$) gas released from industries dissolves in rainwater in the industrial region.

• These gases raises very high in the atmosphere and mixed with air.
• These impurity results in acidic rain.
• Acid rain harms forests and can damage lakes, streams, monuments, etc.