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

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 :

Now look at the reaction given;

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.

a. they are both space stations

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your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.