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Cleaning Capacity of Soap with Hard and Soft Water
1)Which among the following is responsible for the hardness of water?
  
2)Which one of the following combinations is suitable for the preparation of hard water?
  
3)Which among the following are called scum?
  
4)Which one of the following is responsible for the temporary hardness of water?
  
5)Observe the diagrams given below. In which beakers will soap not give good lather?
  
6)While testing the cleaning capacity of soap with water, a student collected water from a river, a lake and a well. Which among them is/are hard water?
  
7)Which one of the following represents the structure of micelle?
  
8)A soap molecule is generally represented as RCOONa. Which one of the following represents the hydrophobic part of soap molecule?
  
9)Observe the diagrams given below.In which beaker is water permanently hard?