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Q.

Which of the following is a combination reaction?


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a

Calcium oxide reacts with water

b

Calcium carbonate is heated

c

Zinc reacts with copper sulphate

d

Heating of iron sulphate 

answer is A.

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Detailed Solution

When calcium oxide reacts with water, a combination reaction takes place.
Calcium oxide reacts with water and undergoes a combination reaction to produce calcium hydroxide. The reaction that takes place is:
CaO + H2O → Ca(OH)2
 
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