Explain the methods used for the removal of temporary hardness of water.

Choose the false statements and rewrite them. (a)Alkali metals possess both +1 & +2 oxidation states. (b) Lithium is found to be the strongest reducing agents among the alkali metals.(c) Manufacturing of rayon is known as viscose process. (d) Washing soda is used to remove temporary hardness of water.

Suggest one method for the removal of hardness.

Briefly explain the methods used to treat cancer.

What causes the temporary and permanent hardness of water?

Write reason for the following: Temporary hardness of water can be removed by boiling.

How is sodium hexametaphosphate useful in removing the permanent hardness of water?

Explain the method of refining copper.

Permanent hardness of water can be removed only by chemical methods. Write the name of any one salt responsible for the permanent hardness of water.