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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.
 

C a O space plus space H subscript 2 O space rightwards arrow space C a left parenthesis O H right parenthesis subscript 2 space plus space H e a t
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.

 

(iii) Following observations were recorded when calcium oxide reacts vigorously with water. Identify the incorrect observations:

I. It is an endothermic reaction
II. Slaked lime is produced
III. Quick lime is produced
IV. It is an exothermic reaction
1 I and II  
2 III and IV  
3 I and III  
4 II and IV  

Ans.

(3)

I and III