Choose the odd one out. Give reasons for the choice.
Magnesium sulphate, calcium sulphate, magnesium chloride, magnesium bicarbonate.

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Solution

The hardness of water:
Temporary hardness of water Permanent hardness of water
The temporary hardness of water is due to the presence of dissolved bicarbonates of magnesium in it.
Temporary hardness can be easily removed by boiling.
The permanent hardness of water is due to the presence of dissolved sulphates and chlorides of magnesium and calcium in it.
Permanent hardness can be removed by adding washing soda or sodium carbonate.
Therefore, Magnesium bicarbonate is an odd one because it is responsible for temporary hardness while all others are responsible for the permanent hardness of the water.

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Sulphates and chlorides of magnesium and calcium cause temporary hardness of water.

Strikethrough the odd one out. Give reasons for your choice.

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Chlorides and sulphates of _______________( sodium and magnesium/ calcium and magnesium) cause permanent hardness.

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Temporary hardness of water	Permanent hardness of water
The temporary hardness of water is due to the presence of dissolved bicarbonates of magnesium in it. Temporary hardness can be easily removed by boiling.	The permanent hardness of water is due to the presence of dissolved sulphates and chlorides of magnesium and calcium in it. Permanent hardness can be removed by adding washing soda or sodium carbonate.