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What is hard and soft water? What are the types of hardness in water? Write the methods used for removal of hardness of water using washing soda? 

Important Questions on Water

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Science>Chemistry>Water>Hard water and soft water
The hardness of water is due to the presence of:
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Science>Chemistry>Water>Hard water and soft water

What is the chemical formula of baking soda?

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Science>Chemistry>Water>Hard water and soft water
The sticky substance formed when soap is added to hard water is _____.
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Science>Chemistry>Water>Hard water and soft water
The temporary hardness of water can be removed by _____ the sample.
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Science>Chemistry>Water>Hard water and soft water

Choose the correct option :

Temporary hardness can be removed by :

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Science>Chemistry>Water>Hard water and soft water
Temporary hardness is due to the presence of dissolved bicarbonates of  _______.
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Science>Chemistry>Water>Hard water and soft water
Which of the following has high content of dissolved minerals?
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Science>Chemistry>Water>Hard water and soft water

The water that does not lather readily with a soap is called _____ water.

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Science>Chemistry>Water>Hard water and soft water
We can remove the permanent hardness by adding
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Science>Chemistry>Water>Hard water and soft water
The permanent hardness of water can be removed by mixing the chemical _____ with the water. (sodium hydroxide/sodium carbonate/sodium bicarbonate)
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Science>Chemistry>Water>Hard water and soft water
Permanent hard water forms:
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Science>Chemistry>Water>Hard water and soft water

Choose the correct option :

  • Water that is fit for drinking is called :
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Science>Chemistry>Water>Hard water and soft water
Temporary hardness of water can be removed by
 
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Science>Chemistry>Water>Hard water and soft water
A sample of water does not form lather with soap. Which of the following could it be?
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Science>Chemistry>Water>Hard water and soft water
Boiling removes the _____ hardness of the water.
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Science>Chemistry>Water>Hard water and soft water
Permanent hardness of water is due to the presence of _______.
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Science>Chemistry>Water>Hard water and soft water

_____ hardness can be removed by boiling. (permanent / temporary)

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Science>Chemistry>Water>Hard water and soft water
 When the calcium and magnesium ions of hard water react with soap, it forms a _____, 
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Science>Chemistry>Water>Hard water and soft water
The chemical name of washing soda is _____. (sodium hydroxide/sodium carbonate/sodium bicarbonate)
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Science>Chemistry>Water>Hard water and soft water

Choose the correct option :

  • Chlorides and sulphates of calcium and magnesium cause :