Multiple choice

Which of the following actually brings about the change in pH of water?

The water pollutants are as follows:
1. Suspended impurities like sand, mud, clay and organic matter.
2. Dissolve gasses like CO2, NH3, N2, H2S. 
3. Dissolve minerals like Ca2+, Na+ and Mg2+ salts. 
4. Dissolved chemicals, pesticides, domestic wastes, etc.
5. Micro-organisms of pathogenic or non-pathogenic nature like bacteria, virus, protozoa, etc.
6. Isotopes or radiologically activated substances.

  1. Landslide and earthquake

  2. Volcanic eruption, dead and decay in organic matter

  3. Decay in plants and animals in swamp deep ponds or lakes

  4. Domestic sewage

  5. Mining activities
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Volcanic eruption, dead and decay in organic matter causes changes of pH in water and may be acidic. Presence of dissolved gasses beyond their normal concentration affect physical characteristics of water and is harmful for aquatic life.

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