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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.

 

(iv) Quick lime combines vigorously with water to form Y which reacts slowly with carbon dioxide in the air to form Z.

 
1 [Y] - Calcium carbonate, [Z] - Calcium hydroxide
2 [Y] - Calcium hydroxide, [Z] - Calcium carbonate
3 [Y] - Calcium , [Z] - Calcium bicarbonate
4 [Y] - Calcium bicarbonate , [Z] - Calcium metal  

Ans.

(2)