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B
False
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Solution
The correct option is A True
Hard water
The presence of specific dissolved Calcium and Magnesium salts in water causes water to be hard.
These following are the salts that causes hardness in water.
Calcium sulphate
Magnesium sulphate
Calcium chloride
Calcium bicarbonate
Magnesium bicarbonate
Magnesium chloride
There are 2 types of hardness of water -
Temporary hardness of water
Permanent hardness of water
Temporary hardness
Temporary hardness of water refers to the hardness of water that is induced by the presence of dissolved Calcium and Magnesium bicarbonates in it.
It can be removed by boiling.
Permanent hardness
Permanent hardness of water refers to the hardness of water that is induced by the presence of dissolved Calcium and Magnesium Chlorides and sulphates in it.
Chemicals like washing soda is used to remove permanent hardness of water.