Foundation
Chemistry Foundation
Double Displacement Reaction
Question

Which of the following equations is not an example of synthesis reaction ? 

4Na + O2 → 2Na2

2Na + 2H2O → 2NaOH + H2 

CaO + CO→ CaCO3

SO2 + 1/2 O→  SO3    

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Solution

A synthesis reaction occurs when two or more reactants combine to form a single product. A synthesis reaction can be represented by the general equation:

             A + B → C

2Na + 2H2O → 2NaOH + H2 

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