CY3151 - EC

The water is said to be hard, when it  contains

• Dissolved sodium salts

  
  

• Acid solution

  
  

• Dissolved Ca and Mg salts

• Precipitate in

Answer explanation

option A

Hardness in water is mainly caused by the presence of 

• Sodium chloride

• Sodium carbonate

  
  

• Calcium chloride

  
  

• Potassium Chloride

A sample of water containing sodium chloride is 

• Soft water

• Hard water

  
  

• Moderately hard

  
  

• Mineral water

  
  

Carbonate hardness in water can be removed by

• Filtration

• Boiling

• Sedimentation

• Washing

Permanent hardness in water is not caused by the presence  

• Calcium chloride

  
  

• Magnesium sulphate

  
  

• Calcium sulphate

  
  

• Magnesium carbonate