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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.

 

(ii) On passing carbon dioxide through lime water:
1 Calcium hydroxide is formed  
2 A white precipitate of CaO is formed  
3 Lime water turns milky  
4 Colour of lime water turns green  

Ans.

(3)

Lime water turns milky