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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.

 

(v) Which of the following is an endothermic reaction
1 Combination of carbon and oxygen to form carbon monoxide  
2 Combination of nitrogen and oxygen to form nitrogen monoxide  
3 Combination of glucose and oxygen to form carbon dioxide and water  
4 Combination of zinc and hydrochloric acid to form zinc chloride and hydrogen  

Ans.

(2)

Combination of nitrogen and oxygen to form nitrogen monoxide