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.

 

(v) Sodium carbonate is a basic compound because it is a salt of a:

1 Strong acid and strong base  
2 Weak acid and weak base  
3 Strong acid and weak base  
4 Weak acid and strong base  

Ans.

(4)