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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 C a S O subscript 4 times 1 divided by 2 space H subscript 2 O. This structure of half water molecule means that one water molecule is shared by two formula units of C a S O subscript 4.

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.

 

(ii) Plaster of Paris is known for its hardening. It is due to:
1 releasing CO2  
2 converting into CaCO3  
3 combining with water  
4 losing out water  

Ans.

(3)