Question

What type of reaction is shown below?

Fe (s) + Cu(NO3)2 (aq) → Fe(NO3)2 (aq) + Cu (s)

Select one:
a. synthesis
b. single displacement
c. double displacement
d. decomposition

Answer 1

Answer:

The correct answer is :

b. Single displacement reaction

Explanation:

The single displacement reaction is the one in which the more reactive element substitute other element in a compound generating a new chemical compound.

It follows this kind of reactions :

$A+BC\rightleftharpoons AC+B$

Now look at the reaction given;

$Fe+Cu(NO_{3})_{2}\rightleftharpoons Fe(NO_{3})_{2}+Cu(s)$

Here the more reactive element (Fe) displaces the less reactive element [Cu]from the compound[Cu(NO3)2].

Hence Fe substitute Cu from Cu(NO3)2 and form Fe(NO3)2

It is not a double - displacement reaction . Where the elements interchange themselves to form the compound.

$AB+CD\rightleftharpoons AC+BD$