Question

Name:

(a) Three dissolved impurities.

(b) Three suspended impurities

that are present in the river water.

Answer 1

River water - It is a form of surface water that receives water from lakes, glaciers and rainwater.

• The water in the river contains two types of impurities namely dissolved and suspended. They are mixed with river water from various sources.

(a) Three dissolved impurities in river water are

1. Salts of calcium and sodium dissolve from the soil into the water.
2. Gases like sulphur dioxide and nitrogen dioxide get dissolved in water from the air.
3. Chemicals and domestic waste from cities and industries.

(b) Three suspended impurities in river water are

1. Particles of soil like clay and fine sand particles get washed away with rainwater.
2. Remains of plants and animals living near the river. For example - wood, dead leaves, bird feathers etc.
3. Living organisms like germs and bacteria come down from domestic and hospital waste.