The molecular formula of washing soda is ${\mathrm{Na}}_2{\mathrm{CO}}_3$.

Give reasons for the following.

• Seawater is saline.

Give reasons for the following:

• Water is called a universal solvent.

Give reasons for the following.

• Temporary hardness can be removed by boiling.

Give reasons for the following:

• Hard water is not fit for washing clothes.

Which one of the following is not a true solution?

What is the chemical formula of baking soda?

A fixed number of water molecules loosely bound to the salts is called

Which is homogeneous?