EASY
Earn 100

Define the following term with examples: 

Hard water.

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:
MEDIUM
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 _____.
EASY
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

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  _______.
MEDIUM
Science>Chemistry>Water>Hard water and soft water
Which of the following has high content of dissolved minerals?
EASY
Science>Chemistry>Water>Hard water and soft water

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

EASY
Science>Chemistry>Water>Hard water and soft water
We can remove the permanent hardness by adding
MEDIUM
Science>Chemistry>Water>Hard water and soft water
The chemical name of washing soda is _____. (sodium hydroxide/sodium carbonate/sodium bicarbonate)
EASY
Science>Chemistry>Water>Hard water and soft water
Permanent hard water forms:
MEDIUM
Science>Chemistry>Water>Hard water and soft water

Choose the correct option :

  • Water that is fit for drinking is called :
MEDIUM
Science>Chemistry>Water>Hard water and soft water
Temporary hardness of water can be removed by
 
EASY
Science>Chemistry>Water>Hard water and soft water
The temporary hardness of water can be removed by _____ the sample.
EASY
Science>Chemistry>Water>Hard water and soft water
Boiling removes the _____ hardness of the water.
EASY
Science>Chemistry>Water>Hard water and soft water
Permanent hardness of water is due to the presence of _______.
MEDIUM
Science>Chemistry>Water>Hard water and soft water

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

EASY
Science>Chemistry>Water>Hard water and soft water
 When the calcium and magnesium ions of hard water react with soap, it forms a _____, 
MEDIUM
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)
EASY
Science>Chemistry>Water>Hard water and soft water

Choose the correct option :

  • Chlorides and sulphates of calcium and magnesium cause :