Question

Temporary hardness of water is due to the presence of the sulphates of $Ca$ and $Mg$ .
If this is true enter $1$ , if false enter $0$.

Answer 1

Hardness of water is the amount of mineral content present in it. Hardness is also of two types, one is permanent hardness and the other is temporary hardness. They are caused by compounds like bicarbonates, sulphates and chlorides of calcium and magnesium.

Complete answer:
As we know there are two types of hardness of water which are temporary and permanent. The difference between these two is that, in case of temporary hardness, salts of calcium and magnesium are present in the form of bicarbonates but in case of permanent hardness, salts of calcium and magnesium are present in the form of chloride.
Here we are dealing with temporary hardness of water. Temporary hardness of water is due to the presence of dissolved bicarbonate minerals such as calcium bicarbonate and magnesium bicarbonate. We have two methods to remove temporary hardness. First one is boiling, in this case when we boil the water the bicarbonates get converted to carbonates. Second way to remove temporary hardness is by Clarks method. In this method the hardness is removed by calcium hydroxide which is also known as Clarks reagent.
On the other hand we have permanent hardness of water. Permanent hardness of water is caused due to salts of calcium and magnesium present in the form of chloride. Permanent hardness can be removed by Gan’s Permutit method, Calgon’s process and ion exchange resin method.
Hence there are no sulphates of calcium and magnesium present.
So the correct answer is $0$.
Note:
As a matter of fact hardness in water is considered vital also as in some places it can be a major source to provide calcium and magnesium in the diet. But hard water is considered prohibited for hair washing purposes.