Explain the disadvantages of hard water.

Explain the advantages and disadvantages of friction .

What are the disadvantages of freons?

Explain the preparation of heavy water

Explain the terms hard water and soft water. Write a note on the (ii) Calgon method for the removal of hardness of water.

Explain the terms hard water and soft water. Write a note on the (i) Ion - exchange method.

What are the disadvantages of deforestation ?