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Solution


Q.

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

 

When two or more reactants combine to form a single product, the reaction is named a combination reaction. For example, calcium oxide reacts vigorously with water to form calcium hydroxide. The reaction is highly exothermic in nature. A lot of heat is produced during the reaction.
 

CaO + H2O → Ca(OH)2 + Heat
Calcium oxide + Water → Calcium hydroxide

Solution of calcium hydroxide is used to white-wash walls. It reacts slowly with carbon dioxide present in the air to form a thin layer of carbonate which gives a shiny appearance.

 

(i) The chemical name of quick lime is:
1 Calcium oxide  
2 Calcium oxide  
3 Calcium hydroxide  
4 Carbon dioxide  

Ans.

(1)

Calcium oxide