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Question


Which of the following represent a double displacement reaction?


Options:
A .   2H2(g)+O2(g)2H2O(l)
B .   2Mg(s)+O2(g)2MgO(s)
C .   AgNO3(aq)+NaCl(aq)AgCl(s)+NaNO3(aq)
D .   2H2(g)+Cl2(g)2HCl (g)
Answer: Option C
:
C
The reaction in which exchange of ions takes place between the compounds of the reactants is called a double displacement reaction.
The reaction between silver nitrate and sodium chloride involves exchange of their ionic counter parts to form the product. Hence, it is a double displacement reaction.
All the other three reactions given are combination reactions. Combination reaction is a reaction in which two or more elements or compounds combine to form a new product.

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