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Solution


Q.

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

 

A compound C of sodium forms a white powder. It is a constituent of baking powder and is used in some antacids. When heated, it gives a compound D which is anhydrous and absorbs water to become a hydrated salt. When this salt is kept in the open air, it loses water molecules in a process called efflorescence. When dissolved in water, it forms a strong base and a weak acid F.

 

(ii) Which of the following is compound D
1 NaHCO3  
2 Na2CO3  
3 Na2CO3·10H2O  
4 NaCl  

Ans.

(2)