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Solution


Q.

Read the passage carefully and answer the following questions from (i) to (v):

 

POP or Plaster of Paris is a calcium sulphate hemihydrate. Hemihydrate contains half a molecule of water of crystallisation. It is represented by the formula CaSO4·1/2 H2O. This structure of half water molecule means that one water molecule is shared by two formula units of CaSO4.

The name Plaster of Paris was given to this compound because, for the first time, it was made from gypsum which was mainly found in Paris.

 

(i) The difference of water molecules in gypsum and Plaster of Paris is:
1 5/2  
2 2  
3 1/2  
4 3/2  

Ans.

(4)