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Question

Which of the following represent a double displacement reaction?

A
2H2(g)+O2(g)2H2O(l)
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B
2Mg(s)+O2(g)2MgO(s)
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C
AgNO3(aq)+NaCl(aq)AgCl(s)+NaNO3(aq)
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D
2H2(g)+Cl2(g)2HCl (g)
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Solution

The correct option is C AgNO3(aq)+NaCl(aq)AgCl(s)+NaNO3(aq)
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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